What do you think the NaziNAziNazi rhetoric is designed to do? Inspire hugs and flowers? Invoke lots of debate?

The same thing that the CommunistCommunistCommunist rhetoric is designed to do. Or saying that Democrats are in favor of mutilating children. Or saying that the Democratic Party:

"does not fight for, care about, or represent American citizens. It is an entity devoted exclusively [his emphasis] to the defense of hardened criminals, gang-bangers, and illegal, alien killers and terrorists. The Democrat Party is not a political party. It is a domestic extremist organization.”

foxnews.com: Stephen Miller: The Democratic Party is a 'domestic, extremist organization'

...or as he finishes that video, claiming that the mayor of Chicago "rejoices" in the bloodbath of that city. It's also the same thing that calling people vermin and labeling them the "threat from within" is designed to do:

"We will root out the communists, Marxists, fascists, and the radical-left thugs that live like vermin within the confines of our country. The threat from outside forces is far less sinister, dangerous, and grave than the threat from within."

You surely cannot think that the rhetoric used by conservatives is limited solely to dispassionate intellectual critiques of policy ideas, right? That conservatives would never use incendiary rhetoric to demonize people they disagree with? Attack not the ideas of progressives or liberals, but attack them as people? You think PizzaGate - the viral effort by members of the alt-right-wing to spread the false belief that there was proof that the Democratic Party was a cabal of pedophiles - was designed to "inspire hugs and flowers" or "invoke lots of debate"?

It's all designed to demean and dehumanize the other side. To reduce their credibility among voters, to use extreme rhetorical comparisons to make people believe that their political rivals are not merely goodhearted citizens who might simply fail to understand what's best for the country, but genuinely evil people who want bad things to happen because that's what evil people do.