People from the Rift
Feels like the strong people are directly preceded by some violent rift of some kind. A massive change to their lives, that brought them closer to the essential things in life, and survival is supported by a powerful conviction that things will have to be better, somehow. Might be correlation based on bad evidence, but a stagnated and uneventful life seems to help bloom the worst of behaviours. Stuff rooted in fear. Because if you never lost something important, then you'll always be devoid of the know-how to come back through the other side.