I think it's understandable that Germans want to try out a right wing extremist party again after the last decades under nominal center or left governments they experienced a lowering standard of living and many issues resulting from climate change, migration and war. not necessarily the fault of the government - just the way the world's going.

calling AfD voters Nazis will reinforce their warped perception that they are part of a "resistance" and that AfD will do something differently, will "clean up" or whatever. addressing AfD voters from a perceived moral high ground will destroy any chances to convince them that AfD has no actual solutions.