““..civility took root at Wikipedia. It grew into a social norm...But sometimes, even the toughest social norms aren’t enough. We found there is always a tiny fraction of people who get a kick out of being rude and abusive, and they won’t stop even when they are asked, politely, to knock it off. Every community has a right and a duty to set expectations for minimum acceptable behavior and enforce standards as a last resort, so we created a system for warnings. Those who ignored the warning could be kicked out briefly. If they came back and kept acting like jerks they got booted for longer. Or even permanently.””