I think the flag has the potential to be useful.

Of course it sounds like a good-idea, but these are just a bunch of self-appointed yahoos who can make exceptions for themselves and their friends at will and enforce their opinions on the rest of us with capricious and tyrannical abandon.

If the blacklists were controlled by the witnesses exclusively, then at least we'd sort of get a "vote", and we could advocate for a transparent appeals process that included some "innocent until proven guilty" procedures along with a standardized "road-to-redemption" for those found "guilty".