I agree. That is my concern anytime I hear someone talk about policing the "misinformation".

Who becomes the police that decides what information is true, and which is false? Why should they be considered the "arbiter of truth"?

Have their actions shown them to be consistently trust worthy?

As you hinted at there have been some notoriously bad/evil people in the past that were certain they were speaking the truth and simply trying to stomp out the "misinformation".