All of those things are true, but I'm talking about why these young men turn to violence in the first place.

I say suicide because Fascism's death cult promotes self-negating martyrdom. It drives the person into a social death before throwing them into actual carnage. The shootings themselves are incidental; they cement the break with their old social self and a baptism into their new martyred self precisely because they see their old self as unworthy. Both offer ideological¹ respite from further action and self-hatred.

¹ (sniff)