Comment by gwd

I seem to remember a talk I heard a very long time ago, maybe by Joel Splosky? He was saying that he'd observed the "population change" effect in USENET; where argumentative jerks tended to stay and helpful people tended to be driven away; and in his mind the "reply in-line" mechanic specifically contributed to this. So the first-order goal he had when he built Stack Overflow was to build a system with mechanics which encouraged helpful people tended to stay and argumentative jerks to be frustrated and go elsewhere.