I was just sitting here thinking and remembered this other case.
If this boy, had never met her, and he'd not discovered Nazis, I think he'd still have eventually killed someone, and, maybe still attempted to kill himself. He became fascinated with Nazis, rather than Horrorcore for instance. If he'd discovered Horrorcore
and Satanic Worship? He'd likely have become another Richard "Syko Sam" McCroskey (or fairly similar) The two couples connected, and the future was set, in both cases.
Emma Neiderbrock's, parents didn't approve of Horrorcore, nor were they sure about the long distance bf, 20, flying in to go to the concert with them (they'd decided to attend with Emma, the bf, and her other friend, as an attempt to bond, and watch out for her, she was hard to handle from all I've read and gathered from interviews.). Emma apparently broke it off at some point, and they were all bludgeoned to death by the bf.
While daughter was troubled, her parents gave permission for bf to fly out, go to show, and spend the weekend with them (they'd never met the guy). So, a bit different but still, very troubled guy, gravitates to a form of entertainment that is very graphic, and, if some accounts are correct, Satanic Rituals too. The girl decides that he's no fun so he gets dumped, at or right after, the show, and he responds violently by killing everyone there, later that night, after they arrive home.
http://murderpedia.org/male.M/m/mccroskey-richard.htm