I mean, speaking from my own experience, growing up was a shit show in terms of learning to express myself. It wasn't until I was an adult that I realized how much I put my anger on other people, or back at myself. The issue is that men are socialized to be like this because of anachronistic and toxic ideas about what 'men' are supposed to be like.
I think a counselor is great but I agree that the U.S. in a larger sense suffers from a kind of country wide horror of alienation.
My main argument in the post above was that this shooter fit an archetype of an entitled, resentful, alienated (white?) male. And the basis for their identity isn't natural, but socially developed. I agree there is no valve for release, but take it further. Why is the rage there in the first place?