I see a problem with points one and two. That problem is partially what spurred the First Amendment of the Constitution (USA) to be made. Trying to control the speech of people is both impossible and forces escalation. When people desire to communicate, they will do so, about whatever topic they choose. Trying to stifle or manipulate this communication will fail eventually; either those who see themselves as part of the "ruling body" will accept this failure, or escalate with more robust controls. Rinse and repeat this through a few iterations, and you end up with the Great Firewall in China. The only way to deal with communication that turns hostile or negative is to increase the communication skills and tools of those involved. Conflict resolution, empathic reasoning, detailed vocabulary, and strong argument skills will allow people to communicate clearly and reasonably. A communicating group that carries many members who have these skills will be deal deftly with these issues, and carry a thick enough skin and strong enough values not to be swayed by the moral poisoning that tends to happen in forums in question.