Lack of a role model, of a consistent father in their life, regardless of exposure to guns, is a huge factor for the boys/men, and they commit most of these crimes by a very wide margin compared to females. The reason is not Trump. That is another antifa desperate attempt to point a finger again.
https://www.patheos.com/blogs/markmeckler/2018/02/27-deadliest-mass-shooters-26-one-thing-common/