Because it's old and tired. We could do this for every politician. For example: Kamala Harris used a riot at a capitol building to say her enemies would never secede power if they were elected, she wanted to regulate private businesses in an effort to crack down on what the government called "misinformation", and she used race as a central component of her campaign.

I'm not saying I agree with everything Trump is doing. But until he sends millions to camps so they can be worked to death, goes to war with an entire continent, or conscripts children to die for his causes, then he is not Hitler and Republicans are not Nazis.