Nazis can be discussed, it is just then when you draw a parallel with something from Nazi Germany many readers will react as if you draw a parallel with the holocaust. Which is also why parallels with nazis are emotionally powerful and thus tempting.

If you compare something today with a fascist movement that most readers lack a particular image off (say the Albanian Fascist Party for an audience outside Albania) you are much freer because it lacks pre-existing emotional content, but then again that lack may make it pointless.

So I would say that drawing parallels with nazis is fine as long as your intention is to draw parallels with the holocaust. Otherwise it is likely that your actual point is lost amid mis-interpretations.

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