So kicking people out of a country is worse than murdering millions of innocent civilians?
Problem is, when people compare him to Hitler, they're comparing him to Hitler before he came to power. Hitler didn't start off by killing a load of civilians, but he used the same stupid rhetoric Trump is using now against Muslims (or Mexicans depending on how the winds blowing that day) to get into power.
There unfortunately are genuine comparisons that can be made to the rhetoric Hitler and the Nazi party used before they got into power.
And unfortunately Hitler wasn't particularly unique. There have been numerous examples of dictators that have overseen murder, genocide and torture of innocent civilians since Hitler died. The lessons of history haven't been learnt.