To sum up...
I find it fascinating that the basic functional makeup of humanity seems to involve two traits that are in conflict with each other.
Not that surprising. Evolution has a long and colorful history of kludges, and if something works well enough to overcome the baggage, why not? I'm not saying it's a fatal flaw by any means.
One would have thought that a "fish" that needed to breathe air, and give live birth, would be an evolutionary conflict impossible to overcome, but the cetaceans are doing pretty well, all things considered.
When you look at the number of humans in the world, and how many are crowded into dense cities, it's actually quite amazing that as few humans kill each other as they do.