Probably not all that groundbreaking, but I hadn’t thought of it until recently:
Brutality is a function of societal evolution. The societies that grow and expand do so, not only because of some technological or cultural advancement, but in large part due to their willingness and propensity to conquer and dominate other societies, often in brutal ways.
Peace is hard, in part, because the human desire for power is baked into all the major remaining people and cultures- any society that leans towards peace will eventually be overtaken by one that doesn’t.
If US society continues to devolve and these people actually attempt to make good on these threats, don’t expect the police to save you. Just saying.