More nuanced laws can prevent such behaviour without impacting free expression. For example, Public Nuisance laws. That way the content itself isn't legislated again, just the appropriateness of the time and place, and the society isn't prevented from having fictional works, history texts, art containing the banned topic.
Yes. Now you don't know who to watch. Forcing conversations under ground just requires a larger intelligence network. Let them say things on Reddit and the like to simply keep track using simple tools.
More nuanced laws can prevent such behaviour without impacting free expression. For example, Public Nuisance laws. That way the content itself isn't legislated again, just the appropriateness of the time and place, and the society isn't prevented from having fictional works, history texts, art containing the banned topic.