It may not be able to remove it, but it certainly can make viewing, storing or disseminating it illegal and punish those that do. Ultimately a legal system is

It may not be able to remove it, but it certainly can make viewing, storing or disseminating it illegal and punish those that do. Ultimately a legal system is how a society controls a governments monopoly on violence. A legal system can remove almost anything if it really want too, by virtue of the fact that it can send big men with guns to destroy whatever physical manifestations of the thing exists. Of course there are practical limits to this power. But that’s never stopped a government before.