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Again, this is just more absurd hypothetical scenarios. The reality is never as ambiguous as you're painting it. What you're describing is how a fascist would conduct a confrontation, not anybody who believes in truth. Nobody here is saying "denials are evidence of guilt" and fascists are not Jedis.

Also, nobody is being silenced here either because there is no obligation built into the first amendment or even the very concept of Free speech to provide a platform for anybody.