I might begin to start that discussion by suggesting that politics is a matter of everyday rationality.

Of course it is. It's also a matter that people fight each other over, in the real world - or rather, that we need a strong framework of civics, institutional rules etc. in order to prevent people from fighting over it. This is a far stronger constraint on plausible solutions. If your solution does not satisfy sensible criteria of fairness, credibility, etc. as judged by a rough consensus of relevant real-world actors (not online sysops or website owners), then you become a political target instead of actually solving the problem. And this is but one tiny little snag that we need to care about in order to address this issue! There are many, many others.