There are also arguments for avoiding the breakdown of communication by expressly favoring the most strongly censored and unfashionable ideas at any given time and striving to platform them everywhere, even irrespective of their actual merits. This is what Herbert Marcuse calls for in his Repressive Tolerance. The point there is not to defend society against anything inherently problematic, but merely to push the very notion and social norm of a "managed", fad-driven discourse to its breaking point. It's a "chaos monkey" approach to the whole problem of communication 'filter bubbles' and 'echo chambers', or pretty much the trollish 4chan model under a different name.