You're a pessimist. You do know that Periclean Athens was viewed as the cradle of Western Civilization and nascent principles of democracy don't you for about 2500 years? Well, the barbaric Spartans were gay too. The Romans did not seem to be too hung up about gays either. Whatever.
I'm not saying that no society ever engaged in same sex acts, or that such engagement instantaneously caused downfall and destruction within 24 hours. Rome was gradually infected by deviancy, to its downfall. And same sex acts were not generally accepted by all, they were considered an abomination by many.