Asimov: I don't know of any science fiction writer who really attempts to be a prophet. Such authors accomplish their tasks not by being correct in t… - Isaac Asimov

I know this much: species evolve only to meet the pressures of new environments. In a stable environment, a species may remain unchanged for millions of Centuries. Primitive man evolved rapidly because his environment was a harsh and changing one. Once, however, mankind learned to create his own environment, he created a pleasant and stable one, so he just naturally stopped evolving.

Violence is the last refuge of the incompetent,

Can't you have genius without criminals?" "You can't have geniuses and saints without having people far outside the norm, and I don't see how you can have such things on only one side of the norm. There is bound to be a certain symmetry.