According to Christopher Harper-Mercer's mother, who was quoted in the NY Times this morning, he had Aspergers Syndrome. Just like Elliot Rodger (the 2014 Santa Barbara killer) and Adam Lanza. (Seung-Hui Cho, the Virginia Tech killer, was initially said to be autistic by family members in South Korea, though that diagnosis was later disputed.)
In his "manifesto," Harper-Mercer bemoaned his inability to get a girlfriend, just as Elliot Rodger had.
There are all sorts of other correlations among both mass killers and serial killers. Profilers haven't been shy about pointing out that most are relatively young males who are loners and most often white.
Being male, or white, seems no barrier to profiling.
However, even though a highly disproportionate share of serial killers have been homosexuals, you don't hear about that as much.
That's probably because gays are a group favored by the media.
Now it seems that a disproportionate number of mass murderers have some degree of autism. Are they, too, a favored group about whom nothing bad must be said?
My experience with Aspies is that they have a hard time dealing with frustration and lash out much more easily. If you doubt that, look at the comments after this post about Aspergers Syndrome and note the number of Aspies who lashed out at me for having written it.
(They won't be happy with this post, either.)
This certainly isn't to say that most Aspies are a threat; only a very tiny percentage of them ever murder anyone. But, if a disproportionate share of mass murderers do have the syndrome, given the current push to not allow those with mental disabilities access to guns, shouldn't this correlation be pointed out?