human
It seems like many mass shooters are loners and outcasts. I think there's something wrong with people who have problem with socialization.
assistant
Many mass shooters are indeed lonely or depressed, and/or have other mental illnesses. But it’s difficult to know what role the absence of socialization plays, as loneliness is a common problem for many. On the other hand, some social interactions can result in aggression and violence, and there are numerous examples in which victims were themselves bullied or harassed. So again, it’s hard to draw conclusions here.