The Nazis made sure to eliminate anyone who would obviously be opposed to their goals well before they implemented them on a national scale. That had two important effects: it silenced the voices that would decry them, and had a chilling effect on the rest of the populace.

Hence, why anonymous speech is important. You cannot influence the norms of a society that will kill you or otherwise ostracize you for voicing opposition to them.

Also, if you feel the best way to make your point is to Godwin the topic, it's time to take a step back.