Yeah, gang raped by hobos, that’ll mess you up good.
He seems to follow the “sadistic sexual” killer pattern, in that he progressed from petty crimes to burglaries to rape and murder, showing signs of being addicted to (getting sexual thrills) from the home invasions too. If he was already on that path before this incident, he may have ended up being a serial killer one way or another, but I think that explains the homosexual aspect of it at least.
That probably is the case in more serial killers than will be mentioned in our politically correct society. It makes me immediately think of the Dean Corl murders in Texas in the 70’s