Its just that population densities were on the whole lower. And there was a lot of land and resources to live from. So the impact was lessened.
But even then, there were in fact tribal groupings that effectively wiped out other tribal groupings.
Also it's becoming clearer and clearer that the line between settled agrarian and hunter gatherer was a lot less clear than we initially imagined. There were all sorts of grain and maize growing societies that continued to rely on deer and fish for their protein sources and trade in skins etc for hundreds of years after they started tending crops.
These are tribes, or in the case of the Mexicans, a civilization. Not hunter gatherer bands.
Meanwhile out west or near the arctic were hunter-gatherer bands. They were not making continual war. They were hunter-gatherer bands and not tribal.
Not sure which side I should be rooting for, but at least hunter-gatherers didn't try to own the land.
Also if anyone wants to say "if it wasn't for the farmers, you wouldn't be here right now," to me, that's not quite the boon you might be imagining. I'm actually perfectly fine with not having existed if it meant that nature wasn't ravaged.
They also had no problem driving species to extinction.
This idea of a group of people living in harmony with nature is fantasy.
You're saying hunter gatherer bands are tribes which is contradictory. Migratory hunter-gatherer bands max out at 50 people. They migrated there was no land which was "theirs", this is the point.
Tribes were hundreds of people, often had class systems within them, often had surplus and farmed. So yes, tribal farmers had conflict but they were not hunter gatherer bands.