Fitting abbreviation -- those two guys spout BS, indeed: no mention of gatherers who were more dominant than (or at least on equal footing with) hunters; war is a rather young social phenomenon that started in 4th millennium BCE, not an evolutionary given; and so on. Violence is not *the* default of human nature, just one of its many expressions. A choice, if you will. And it definitely does not make one more adult (or even successful).
All in all, all of these utterly dumb social Darwinists forget that the evolution is the survival of the fittest, not of the most powerful (case in point, Julius Caesar whose direct blood line, as far as I know, vanished within c. a century after his violent death). Furthermore, all (biological) systems gravitate toward homeostasis, not dominance. Health is always found in equilibrium. If that equilibrium is disrupted long enough, it always leads to sickness. That's the true nature of nature.
Frankly, if these beta folks are so fond of violence, I hope they will enjoy in full when they eventually turn into bloody pulps. After all, who lives by sword...