Yes, my argument wasn't so much against Nietzche but more against philosophers like Thomas Hobbes for example who bases a lot of his thinking on the assumption that man in his natural state, without society, is extremely prone to war and aggression. Despite being cynical being such a trend trend, in the light of evolutionary science today, Hobbes was likely a bit too pessimistic. He didn't have the means to understand the human nature the way we can today and so some of the writings he's famous for rest on shaky foundations.
Of course he might still have a lot of good points, but it turns me off a bit.