Somewhat similarly to an “evolutionary tree” with shared ancestors, abused people were often abused themselves. “Breaking the chain” of trauma could also be considered a “mutation”, in that its another form of nature “rolling the dice” to see what pans out. Conversely, people with happy lives often create happy children, perpetuating the behavior.
Apparently my friend’s perception, which to him seemed like cosmic truth, was that ALL hate is from generational trauma. Can’t say I agree - people can certainly develop new prejudices based on their own individual experience. But sometimes an idea that clarifies your own issues can feel like discovering cosmic truth.