To be honest I am willing to bet a lot that the most outspoken and extreme homophobes -- and I think we need to make a distinction here between ignorant christers who just follow what the pastor told them and clinically obsessed hate-spewing maniacs -- are experiencing same-sex attractions themselves and are having trouble coming to terms with them, be it because of their religion, upbringing, environment or any other factor. It's not so much directed at the LGBT community, but at their own sexuality itself. It's an inner battle manifesting itself on the outside.
Speaking from personal experience, at the time I had most difficulties dealing with my sexuality, I resented LGBT individuals. Having experienced self-hatred and lack of acceptance myself, I can't help but feel sorry for those people. It's a terrible mindset to have. This, of course, doesn't justify the atrocious things they say. It just gives a little insight into what might cause this behavior.
Speaking from personal experience, at the time I had most difficulties dealing with my sexuality, I resented LGBT individuals. Having experienced self-hatred and lack of acceptance myself, I can't help but feel sorry for those people. It's a terrible mindset to have. This, of course, doesn't justify the atrocious things they say. It just gives a little insight into what might cause this behavior.