Because they're too selfish and can't realize that they have a mental disorder. Homosexuality is an illness, it's dangerous for the survival of a species since it doesn't lead to reproduction. Sure, some people say it's found in nature, yes, but so are tumors and cancers. Because something exists it doesn't mean it's "natural" or positive.
You're a good kid, too bad there aren't many of you left. Don't listen to what the liberal fools say.