They're genuinely scared they will end up on some list, and Trump or others will take their revenge. Because it's been done so much on the left, the return volley is now scary to them.
Since they truly believe Trump is Hitler, they're expecting camps. So, they are deliberately keeping their mouths shut until "freedom reigns".
The others are trying to conspiracy theory the idea it was fake, or act like it never happened.
Why stop at four? I'd rather their lunatic ravings become socially unacceptable within society in perpetuity. The bad behavior need not become commonplace again.