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
Library should serve the community, and if the community feels it isnt doing so in its best regard they fully have the right to it, whether or not other people on the opposite side of the country like it