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'Staying Longer At Home' Was Key To Stone Age Technology Change 60,000 Years Ago (phys.org)
A new study by scientists at the University of the Witwatersrand suggests that at about 58,000 years ago, Stone Age humans began to settle down, staying in one area for longer periods. The research also provides a potential answer to a long-held mystery: why older, Howiesons Poort complex technological tradition in South Africa, suddenly disappear at that time. Phys.Org reports: The Howiesons Poort at Sibudu contains many finely-worked, crescent-shaped stone tools fashioned from long, thin blades made on dolerite, hornfels and, to a lesser extent, quartz. These "segments," as they are called, were hafted to shafts or handles at a variety of angles using compound adhesives that sometimes included red ochre (an iron oxide). A diverse bone tool kit in the Howiesons Poort includes what may be the world's oldest bone arrowhead. Certainly a variety of hunting techniques was used perhaps including the first use of snares for the capture of small creatures. The animal remains brought to Sibudu reflect this diversity for there are bones from large plains game like zebra, tiny blue duiker, and even pigeons and small carnivores. Soft, clayey ochre pieces were collected in the Howiesons Poort perhaps at a considerable distance From Sibudu. Clayey ochre is useful for applying as paint. The beautiful Howiesons Poort industry with its long, thin blades is replaced at 58,000 years ago by a simple technology that could be rapidly produced. Coarse rocks like quartzite and sandstone became popular. These could be collected close to Sibudu. Post-Howiesons Poort tools were part of an unstandardized toolkit with triangular or irregularly-shaped flakes. Tiny scaled pieces were also produced using a bipolar technique (in the simplest terms this involves smashing a small piece of rock with a hammerstone). The study has been published in the journal PlosOne.
You can see best from Fig 1. in your link. They aren't randomly flaked, but usually in a pattern of larger to smaller flakes to create a fine edge. And I think the other figures are showing what are known as "hammers" that were used to create the blades. They would show repeated impacts in the same place or scratches in a certain area.
That aren't just random crushed rocks, if you know what you are looking for.
I think your professor was over-generalizing. Pre-Contact American societies may have been relatively less warlike than the Europeans, but things were definitely not uniformly kumbaya in the Americas. There is lots of archeologcal evidence of people coming to violent deaths in warfare.
Africa, especially in the north and toward the Equator, tended to be even more violent than Europe.
The best quote, I think, of Ken Burn's The Vietnam War is from Karl Marlantes, an ex-Marine: "One of the things that I learned in the war is that we're not the top species on the planet because we're nice. People talk a lot about how well the military turns, you know, kids into, you know, killing machines and stuff, and I'll always argue it's just finishing school."
So no, don't discount the possibility of inter-tribal warfare.