It's quite interesting to me that you can find homeostasis in physiological systems, but not in social systems, where runaway effects prevail. And seemingly a more robust social system would create a tendency for people to reach a more stable social state rather then continue to descend in a downward spiral.

(BTW the "negative feedback" loop mentioned in this topic is technically still a positive feedback, because the effects of the cause produces more of the cause. True negative feedback creates a counteractive force that promotes equilibrium- it has nothing to do with emotional negativity)