I don't know. I think you may not have seen much yet. Depending on what happens under climate change, there may be some pretty big and unsolvable conflicts ahea

I don't know. I think you may not have seen much yet. Depending on what happens under climate change, there may be some pretty big and unsolvable conflicts ahead when entire regions are affected. Overall, assuming the universe has some arrow towards something we arbitrarily defined as "progress" has no rational scientific basis, AFAIK? "Adaptation" we have proven, but that has nothing to do with what we see as progress. Adaptation may very well be less brain, less culture, less humans. I think if you want to have only certain types of developments and behavior you need to continuously and forever fight against the randomness of the universe, whose forces, have no purpose or direction. War and aggression never was off the table - it became more organized and carried out by large-group actors. Individual violence is down, it cannot compete with organized humans. Then the nuclear deterrent may have prevented a few invasions. The post WWII peace period in the countries most here (including myself) care about was not that long, and we still had wars even so (Yugoslavia, and at the edges of "Europe" in former Soviet areas).