First off, ideas are not a marketplace. Every useful idea has some call to action as part of it. That call to action may be a call to raise or lower taxes, a

First off, ideas are not a marketplace. Every useful idea has some call to action as part of it. That call to action may be a call to raise or lower taxes, a call to install bike lanes, a call to write more books about race car driving. These actions are frequently incompatible, and so they must be communally chosen. This is in contrast to a free market, where each individual can choose between available options. Second, even if ideas are treated as a market, movements can have disproportionate power compared to their "market share". The level of group support required to implement a policy depends on the specific policy. If 5% of people support defecating in the local lake, and 95% of people support the idea of swimming in the lake and using indoor plumbing, the result is not a swimmable lake. In the same way, a violent movement with very low popular support is unlikely to win any elections, but can still make it entirely unsafe for that movement's targets. Third, personal anecdote time. A few years ago after watching the "Alt-Right Playbook" [0], a YouTube series about recruitment and radicalization tactics used by the alt-right, YouTube recommended that I watch Nazi propaganda. I do not say that in any exaggeration. The video title had the phrase "The Jewish Question", and I was expecting a history on how that phrase had been used in racist fearmongering. It was instead exactly that same racist fearmongering. Even if I were to hold that all speech is permissible without repercussion, there is still a world of difference between allowing Nazi propaganda to exist, and active promotion of propaganda of that same propaganda. TL;DR: Ideas are not a marketplace, and lack of promotion is not the same as silencing. [0] https://www.youtube.com/playlist?list=PLJA_jUddXvY7v0VkYRbANnTnzkA_HMFtQ https://www.youtube.com/playlist?list=PLJA_jUddXvY7v0VkYRbAN...