Looking at the underpinnings of this terrible crime, I don't think that homosexuality has anything to do with it in a substantial way.
This system of diversity-entitlement that our society has established appears to be much more at fault than "evil" or mental illness. If you tell someone that they deserve to succeed because of their race and you bend over backwards to give them more opportunities than other people and then that person is still a failure you have set up a perfect recipe for resentment, hatred and potentially some violent acting out. Apparently this murderer could not perform adequately in his high status dream job, was fired and then spent two years working at a call center as his hatred festered.
This system of diversity-entitlement that our society has established appears to be much more at fault than "evil" or mental illness. If you tell someone that they deserve to succeed because of their race and you bend over backwards to give them more opportunities than other people and then that person is still a failure you have set up a perfect recipe for resentment, hatred and potentially some violent acting out. Apparently this murderer could not perform adequately in his high status dream job, was fired and then spent two years working at a call center as his hatred festered.