I think just to keep driving that wedge in deeper. Divide and conquer keeps people fighting each other instead of fighting the establishment ruling over them.

It's why subreddits like /r/enligtenedcentrism exist, where they basically make fun of anyone who is not a liberal extremist. And they've poisoned the phrase "both sides" by associating it with reactionary idiocy.

The goal now is to get rid of all the moderates, so only extremists exist anymore. Then it's much easier to run the re-election numbers because you're much more certain of how everyone is going to vote.

Basically, they want control. And the good way to get it is by controlling the minds of others, and the best way to do that is to destroy any moderates and any moderate conversations. Thus from the naive standpoint, the options seem to become "literally nazis, or the sane people". And of course then the latter is the obvious choice. They want everyone thinking like this.

And everyone who refuses to think like this, will now become "the bad guys who are shunned by society". And things just keep polarizing.