Lol, you have poor reading comprehension don't you? I never claimed that gay people wake up one morning and say "Gee I think I want to be gay", but some people do choose to experiment and find they enjoy it and continue with the practice thus choosing the lifestyle.
People choose all kinds of self-destructive behavior so that " I definitely want to subject myself to becoming a public minority that is beaten, killed, and ridiculed..." line doesn't really work. I mean why would anyone ever do drugs or smoke considering the well known consequences? Because it feels good in the moment. Why would a female dress very provacatively and then proceed to intoxicated to the point of blacking/passing out in a house full of horny young men?