A. I'm not entirely sure that things that used to be human nature no longer are. We deal with them, surpress them, sublimate, etc. Anger responses, fear, lust, possesiveness, nesting. The animal instincts of the human animal. How those manifest does indeed change, but not the "nature" of them.

B. We live (in the USA) in a long-term culture of anti-intellectualism. Obviously this doesn't mean it can't change... Sometimes it seems like it will (remember the days before nerd-chic?), but in a nominally democratic society, there will always be a minority of people who are relatively "intellectual" by definition, we should recognize that you don't have to overcome anti-intellectualism, you just have to raise the bar. While still anti-intellectual, in many ways even the intentionally uninformed know more than the average person did back in the day. (just like there will always be a minority of people who will be "relatively tall", even as the average height has tended to increased over the generations)