1.) No matter what facts our world is based on, humans will survive, we're too resourceful, greedy, and arrogant to die.
2.) When robots take control of the world and kill every living human being, then this will be a semi-respectable place, but not exactly respectable. Our bones will still be lying in the earth, which tarnish the planets respectability until they decompose completely.
3.) Hell yea, man! It's called Scientology, just follow Micheale or whoever the hell is in charge now and all your problems will be solved for a mere 1500$ and 1 hour.
4.) I think that's already been answered. We made guns, and look how many of eachother we've mindlessly and mercilessly killed with them.
5.) Uh, they let us live?
6.) Becuase we don't have to think as hard, and like school vs. videogames, it's a helluva lot more entertaining .
7.) There is a cure, and no, it hasn't been withheld from the public as you say. It's called STOP... HAVING... SHEX!