But all the rules in the world can't solve for bad actors - both speakers and listeners.
There's a fluidity to human interaction that rigidity of rule sets will never totally compensate for.
And too many rules can be counterproductive and be empowering to bad actors who thrive in increasing beaucracies, at the least by making it difficult for everyone else so they look good by comparison. Then the whole focus gets lost. More time is spent navigating, adhering to, debating rules than the primary focus...
And trolls love thst shit.
Despite that, for groups where people come from very different origins and cultures, it is better to spell out the expected rules of behaviour to some degree. "No rules" only works when participants are homogeneous enough that all them already know the rules.