Should it be permissible, both legally and ethically, for governments to censor

Should it be permissible, both legally and ethically, for governments to censor

Should it be permissible, both legally and ethically, for governments to censor material either in print or online that instructs how to commit violent crimes (e.g. "How to Make Plastic Explosives" or "How to Poison the Water Supply")? Are such materials really considered to be "Speech?" Many Western democratic societies allow hate speech, and incitement is only ever prosecuted if it calls for direct violence against a particular group or individual; instructional manuals need not call for violence against people or any action at all. But at the same time, people like Timothy McVeigh have carried out acts of mass violence by using such manuals.

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