That's like how some online games don't entirely ban cheat users but only match them with other cheaters, giving them a taste of their own medicine. There's a tipping point in the evolution of communities. When there are too many acting in an anti-social manner such that fun or business is impaired, people quit. If not addressed the community permanently declines.

There's a term of art in philosophy called universalizability (Kant). Basically, what would happen if everyone followed a principle or strategy. Locke spoke of the social contract - civilization is not compatible with unlimited individual freedom.

Reddit already has an interesting user sorting and self-selection process: sub-reddits. People can more easily congregate around common interests. They don't even have to buy a domain, learn HTML, or pay hosting bills. Which would seem to reduce flame wars. But this can result in groupthink and safe spaces for extreme views.