Yes, the shooter wrote it (sorry for the sloppy attribution). It is interesting that he easily pinpoints the profound influence the music has over him. And yet it is denied by everyone else. I was at a rock concert tonight (Motion City Soundtrack, Anberlin, Mae) and lemme tell you. The stuff moves you.
I am an oldster who has never been to a rock music concert.
But, of course, rock music does influence those who listen to it. It’s intended to do so.