Agreed.

"Nevertheless, I am sure that during the next century, people will discover how to modify both intelligence, and instincts like aggression."

No stopping to ponder whether removing "aggression" from humans might have some unexpected negative consequences? I find this kind of technological utopianism troubling from the likes of Kurzweil, as well. The people who debate him tend to question the feasibility of the advances he predicts. But to me the more important question is whether some of these "advances", and their possible repercussions, are even desirable.