Can they? It doesnt seem so simple because they have no way of knowing which posts are edited in good faith vs not.

They can try to undo comments which sre repeated 10x+ times or something I guess, but editing users comments seems like a really bad move

Edit your content, dont just delete

God why is everyone on reddit a cynical asshole?

Why do people care about preserving their “identity” and posts so much? This was never a thing in the old internet.