The repercussion to bad speech and ideas is inherent to the current paradigm of the internet: downvotes and ostracization.
Maybe they will wind up on their own forum saying despicable shit, but they were probably going to do that anyway. Bad ideas love a vacuum away from prying eyes and outsiders.
Yes, absolutely. We should all be concerned with the source of our ideas and even our memes, as dumb of a concept as that is.