[cywick]

It sounds like you have never been a moderator for an online community of at least moderate size.

If you've never been in that role, it's easy to not only underestimate the sheer amount of garbage that you need to remove, so regular users won't be turned off and leave, but also the dedication and finesse of some of the trolls, who love nothing more than asymptotically approaching that line, without ever fully crossing it.

What you propose is effectively giving these guys a doomsday device (i.e., "if you censor me erroneously, your platform will be dead"). In that scenario, there is a 0% chance that a place like Facebook would not turn into an absolute cesspool.