Some autistic adults openly admit that they were aggressive as children, and even describe the behaviors they used to engage in at school—kicking, biting, punching, etc.—in their postings on social media. However, these adults view their past behavior very differently than the (normally neurotypical) researchers who study aggression in autistic schoolchildren. Researchers have identified a number of risk factors for aggressive behavior: sensory sensitivities, hyperactivity, irritability and sleep deprivation, poor communication, mood issues, etc. In most cases, however, autistic adults writing about their own childhood behaviors ignore such factors, and instead identify situational cues for aggression. They generally remember acting aggressively either when they were taken by surprise (being touched or approached without warning), or—much more frequently—when they were being bullied.
Within the general school population, bullying often causes or contributes to “externalizing behaviors” (negative actions directed towards others) as well as internalizing problems. Since school bullying has a disproportionate effect on autistic children, it is hardly surprising that externalizing reactions are fairly common within this group. However, because their victimization so often goes unnoticed, it is difficult to determine whether autistic kids are any more likely than neurotypical kids to respond aggressively when bullied. What is striking is how often the morality of aggression is debated within the autistic community. Bullying is one of the most frequent topics of discussion for autistic adults on social media, and often these discussions turn into debates over whether fighting back against bullies is morally justifiable.
On the one hand, there are those who consider fighting for any reason morally wrong, and who report having refused to fight back against bullies as children:
My sense of morality has always been strong. Even as a 6 year-old, I found it hard to misbehave like the other kids in the classroom because I couldn’t understand why anyone would want to be “bad” on purpose. I also never hit back kids who hit me since it never occurred to me to hurt anyone. The fact that people hurt each other for pleasure has always been a concept I never understood.
I’m a pacifist. I know this is a very extreme view, but no matter how much someone hurt me I would not view it as being right to fight back, (at least not physically). I have been hit and not hit back.
In keeping with this viewpoint, some autistic adults recall being aggressive when they were young, and then emphasize how they have matured since then:
I have anger issues though they have improved over the years. When I was in primary school, not only I got angry easily, I was also very violent. I punched someone in the stomach (I still think she REALLY deserved that), I pushed three of my classmates, kicked two and I attacked a 5th grader in 2nd grade. Fortunately I’m not violent anymore. I sometimes become angrier than I’ve ever been in preschool but I’ve never resolved to violence these past few years.
The implication of posts like this is that fighting back is wrong and should be avoided. Unfortunately, though, if bullying continues after children grow and learn to control themselves, the anger that is no longer turned against others may be turned inward.
I used to [be aggressive] definatly, when I was young (up until the age of 7) I used to bite people when they annoyed me. Now I am way more likely to hurt myself than anyone else. I still get angry a lot but it is more just frustration at myself. 
Growing maturity and self-control may have prevented violence against others, but they have also led to depression and self-harm (“I am way more likely to hurt myself than anyone else”).
On the other hand, there are autistic adults who consider hitting back an appropriate response to bullying. They may remember choosing violence as the only option available to them, after their schools failed to stop other children from bullying them:
I think part of the reason I hit other kids was because I felt they weren’t respecting me. Sometimes they would ignore what I was trying to say, and I got mad and wanted their attention, so I hit them. It also might’ve been because I wanted to get even with the kids who picked on me, and hurting them seemed like the only way to do that; whenever I told an adult, they usually said something like “I’ll keep an eye on him.” and wouldn’t actually do anything. Sometimes they would take action, but it was rare for that to happen.
They may recall with pleasure that the bullying stopped after they retaliated: “I’ve hit bullies out of anger. Oddly enough, getting the crap beaten out of them made them not want to bully me anymore. Shocking!” They may defend and even extol violence as the only practical solution to the problems faced in school:
In elementary school, I was bullied pretty horrifically by a couple people at whichever school I was attending, from pretty creative insulting/verbal abuse, to outright attempts at fighting me. I just reacted as violently as I felt was appropriate, and sometimes I got in a lot of trouble. When I look back on it, I think I did the right thing, because by the time high school rolled around, I didn’t really catch any flack from anyone, except for one guy who called me a “fag” but is now a gay porn star. Irony at it’s best. I say, this is how you deal with bullies: beat the ever-loving **** out of them. If they get the better of you, spit blood in their eyes, and while they can’t see, go for the nose. That works as a metaphor for life, as well.
Assuming that autistic adults correctly remember their childhood reactions, it would seem, then, that many did not automatically react violently to bullying. Many simply “took” the abuse, either out of a keen sense of morality or perhaps because they were unable to react fast enough. Others chose to fight back. The saddest cases, however, are those who remained non-violent until the cumulative impact of the abuse completely overwhelmed them, and they “snapped.” This last group will be the subject of the next post.
 Other autistic adults report that they refused to act aggressively in school—see the statements cited below.
 “Aggression Against Self and Others.”
 See earlier post on “Reactive Aggression.”
 For a recent summary of research on this issue, see A. Reijntjes, et al., “Prospective Linkages between Peer Victimization and Externalizing Problems in Childhood: A Meta-Analysis,” Aggressive Behavior 37 (2011), 215-22.
 See, among many possible examples, the following discussions on the Wrong Planet website:
“Why Not Fight Back?” http://wrongplanet.net/forums/viewtopic.php?f=22&t=6907&start=15
“Why Are So Many With AS So Passive And Unwilling To Fight Back?” http://wrongplanet.net/forums/viewtopic.php?t=53145
“When And How Should I Fight Back?” http://wrongplanet.net/forums/viewtopic.php?t=344927.
 nirrti_rachelle, in the “Autism and Morality” discussion: http://wrongplanet.net/forums/viewtopic.php?t=260199.
 sarahstilletos, in the “Why Are So Many With AS So Passive And Unwilling To Fight Back?” discussion on the Wrong Planet website: http://wrongplanet.net/forums/viewtopic.php?t=53145.
 Mushroom, in the “Anybody Here Have Serious Anger Issues?” discussion on the Wrong Planet website: https://wrongplanet.net/forums/viewtopic.php?t=33451.
 Grim, in the “Anybody Here Have Serious Anger Issues?” discussion: https://wrongplanet.net/forums/viewtopic.php?t=33451.
 coalminer, in the “the Did You Struggle in Elementary School More Than in Later Years?” discussion on WrongPlanet: https://wrongplanet.net/forums/viewtopic.php?t=357368.
 pat2rome, in the “Bullying Survey: Most Teens Have Hit Someone Out of An[ger]” discussion on the Wrong Planet website: http://wrongplanet.net/forums/viewtopic.php?t=141399&p=3156818
 JCPHN, in the “Bullying” discussion on the AspiesCentral website: https://www.autismforums.com/threads/bullying.5414/page-4.