It can stifle public debate. That danger underlies the view, still operative in the US, that opinions, however obnoxious, should be freely expressible, so that they can be opposed by counter-arguments.
但监督人们想什么的法律还有一个更大的危险。它可能扼杀公共争论。这一危险导致了至今在美国仍有市场的看法，即观点不管多么令人讨厌，都应该可以自由表达，因此可以被反对观点驳斥。