Yes, probably.
From what I can tell, "human history" is a very, very violent subset of "the timespan in which humans have existed". The time before cities and crops and metal and nations probably wasn't filled with carnage, so overall humans probably aren't adjusted for that either. If anything a modern human is way more exposed to human conflict than most people ever born.
If this is any measure to go by, having no cities nor crops was no obstacle to mayhem and carnage.
At the time of the battle, northern Europe seems to have been devoid of towns or even small villages. As far as archaeologists can tell, people here were loosely connected culturally to Scandinavia and lived with their extended families on individual farmsteads, with a population density of fewer than five people per square kilometer. The closest known large settlement around this time is more than 350 kilometers to the southeast, in Watenstedt. It was a landscape not unlike agrarian parts of Europe today, except without roads, telephones, or radio.
And yet chemical tracers in the remains suggest that most of the Tollense warriors came from hundreds of kilometers away.
Humans are very good at organizing to eliminate competition, it is our social intelligence which sets us apart from less successful species. I can't think of any nomadic civilizations that weren't capable and willing warrior-hunters, and of all the first civilizations which settled down to make the first agrarian urban civilizations, I can't think of any that were peaceful or weren't conquered and expanded by a martial invader.
A 10,000 year old battle site in Kenya shows that prehistory wasn't a peaceful subset of human existence, it was just a subset of human history our ancestors could not preserve the history of.
There were no signs of deliberate burial, and several individuals have multiple major traumatic lesions including an obsidian bladelet embedded in one of the skulls.
The only difference between today and yesterday is that we have far more ways to inflict injury, even to friendly and allied humans - past experienced no side effects from using an obsidian hatchet the same way today's humans can be injured from constant exposure to explosions for example. But I also think that while we are not any less or more violent than 10,000 years ago, our capacity for restraint has certainly been cultivated. Urban society cannot progress without at least the smallest honour amongst thieves, even where some societies fail, others succeed. For citizens of nations in North America, it is likely they are insulated from conflict more than most people ever born