Problem is, in a less developed culture, there is still competition due to human nature and due to uncontrollable factors such as natural disasters. Pre-European-Contact Native Americans often fought against one another during periods such as drought.[1][2] Ironically one of the benefits of civilization is a stronger ability to handle situations of disaster and shortage that forces populations to go to war.
I'd also add that in a "civilized world" there are probably more avenues in life open to a person who isn't bound to the responsibility of food production (which constitutes 90% of a hunter-gatherer society). Science, history, the arts? Aside from oral traditions, all are outside the reach of a primitive society.
Oh, and at least in a modern civilization such as ours we have a small fighting chance against say, an incoming apocalyptic asteroid.
[1]https://blogs.scientificamerican.com/cross-check/thanksgivin... [2]https://www.reddit.com/r/AskHistorians/comments/25cvxm/were_...