People often bring up Karl Popper's Tolerance paradox as an opposition to arguments for free expression. However Popper himself stated that "as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be most unwise."

Suppression of intolerant thoughts and ideas is not a counter to them. It helps them hide by not allowing them to be openly discussed, countered, ridiculed and shown to be false, harmful and unhelpful.

It gives such ideas the legitimacy of being "What they don't want you to hear!!", rather than the downfall of being openly known by all to be stupid, laughed at and derided.