In this case, the popular opinion that would get them down voted is "The conspiracy theory that the world is secretly run by evil Jewish people is both false and racist."

Comments that vague-post about "I would say something but people would down vote it" should be expected to be down voted. Either it is too vague to add anything useful, or it expresses the same belief that they believe will be objectionable.

Worrying about your internet score is a sucker's game. Post what you believe, or don't bother.