Now that's a nice breath of adult thinking for us all, Jeremy, especially as anyone close to the Brexit situation has by now witnessed how absurd and doctrinarian political thought becomes in moments of great importance where, rather than common sense prevailing, minds revert to the tribal.
I would suggest that the only way of running such a section afresh, and keeping it graceful, would be through ruthless management where anyone at all found guilty of abusing polite conversational and behavioural ethics and norms is instantly removed from that section of LuLa. Personal attack is not ever very helpful in arguments/discussions and often betrays realization of defeat in one's own logic.
I would not ban offenders from LuLa entirely, though, because seeing red in one sphere doesn't imply that they have such a fixation in others.
Rules rule. But of course, that all demands a lot of time - yours!
Rob
P.S.
Just as I posted this, the 'phone rang, and I discover that I now have an eye appointment at the hospital for the 15th April, and may get my cataracts attended to before I am in danger of losing access to Spanish health care!