Reducing this post to simplistic reasons, as to why the Morality thing will be argued endlessly.
"Free Will." Just look at the start of every bread. Boobs. Worshiping of nakedness. Start there. That is the worm in the mind, of "Whatever, I can do whatever I want." That was the snake tempting eve, was it not? Why yes, you can, but at what cost.
Change the individual heart, and you can change the world. One selfish MF and it's over. Contagious.