I get the desire to moderate your game, but how are words 'harmful' exactly? Especially random, throwaway internet spew. Harmful to your game's reputation, maybe. But to the people?
Clearly you haven't been exposed to much of the underbelly of the internet. Words can translate to physical harm and actions in the real world, and do regularly
call your wife a fat sow everyday in earnest for a year and see if she isn’t granted a divorce for maltreatment.
no one is claiming words are physically harmful, but let’s not pretend they don’t have a very real impact on the world around you.
we protect the legal right to speech specifically because words have power, not because they’re useless.
if words had no power, we wouldn’t fight so hard to protect them from government abuse.