Cultures that become as perverted as ours is never last long after perversion takes root. Greece did it. Rome did it. One of the Pharoahs married both his mother and a brother. Then these cultures fall and are conquered by a less perverse people.
You're really terrible at history. None of those cultures fell because of their perversions.
And Gay Marriage is not a perversion.
It's people like you, who die of stress, because they're so goddamned worried that their neighbor is sticking his penis in the other neighbor man.
There are many reasons for societal collapse. We're doing all of them. They all had profound cultural perversion as a component. To those that are sympathetic pedophilia is not a perversion. Neither is necrophilia. It isn't at all surprising to see homosexuality considered normal behavior instead of the perversion that it is.