The general consensus is that once you introduce Hitler into a debate or argument you have lost that argument. I also subscribed to this opinion, however I have changed my view on this.
I believe, not comparing some current far right politicians to Hitler, is a mistake. For example, despite what Putin thinks he is, he basically has become a far right dictator, who is following a similar path as Hitler in 1936-1939. But Putin is is not only one.
Hitler didn’t start off as a dictator he gradually became a dictator, He started with legitimate political means. He also knew how to tap into the zeitgeist of the German population in the 1920s and 1930s, When I say the German population I mean the mainstream conservative German civilians. They were afraid that their values were slowly being eroded, although there was no clear evidence of that, it was the perception of the time.
They were not listened to by other politicians, Their concerns and fears were not addressed. Hitler did listen, he devised most of the Nazi policies, based on those fears.
The far right and far left movements, they are basically the same but in name, that are emerging at the moment globally are doing the exact same thing as Hitler did. But if you say that in a debate nowadays, you are immediately dismissed.
We should listen to all opinions and if there are concerns, be they real or just a perception, they need to be addresses and not dismissed.