Denials of the Holocaust have also been a great spur to careful historical documentation of Nazi atrocities. They have also encouraged the pursuit and prosecution of war criminals and the commitment of resources to fight racism and all manner of other prejudices against minorities. Holocaust Revisionism was and is the bogey man. Holocaust Revisionism is and has been beneficial to society. Instead, they eliminate the most effective weapon we have for improving things.
Criticism is beneficial.
That's how lies are changed or replaced by truths - as is happening right now to that avalanche of Holocaust propaganda. And this is the benefit which may be had of books promiscuously read. But these are not the only issues that the Supreme Court has overlooked in the past. Besides the irrelevance and fiscal waste of anti-speech laws, and the fact that unwelcome speech frequently has surprising and important benefits, there is another powerful argument that has gone unacknowledged. This is that freedom of expression is a constitutive element in respecting the moral dignity of persons.