I wasn’t ironic but you make a very important point: “even mosters can manipulate the public opinion to appear as decent people,”

This, or, “monsters” can manipulate the public to the point that what their opinion of what is “good” is accepted as a fact. See: religious extremism. See: fucking TRUMP.

Which then leads to: “even decent people can be unjustly flagged as monsters and will be helpless to prove their innocence”