I fail to see the relevance of this post and it comes off as if people want to victim blame. A lot of people have problems. A lot of people get bullied. Just think about the thousands of women who get raped and sexually abused throughout their lifes.
Mass shooter fit a profile, sure. They obviously aren’t happy people. But the reason why they do this is not what has happened to them in their lifes. Otherwise we would have a lot more mass shooters.