It's not only about what caused us to evolve, but what our evolution means, and where it's going.
Evolution is about weeding out the weaklings and producing a new generation more adapted than the current one. That's the only meaning to it. As a concept - it hates sick people, disabled people, stupid people, etc. But as a race, we tend to these people. So we are fighting natural evolution and shaping our own.
Oh crap. I've become involved.
Oops.