I have been taught good history, by my professors at uni, I am teaching history myself actually, have today actually.

Of course they had their propaganda, scare tactics against opponents and so on. Just like all populists, from the AfD, to MAGA. But they were in ar least one State in the Koalition, so part of the government, in 1930.

After that they were more and more populistic and hateful and despite that they won more and more votes over the following years

https://de.wikipedia.org/wiki/Nationalsozialistische_Deutsche_Arbeiterpartei#Wahlergebnisse_bei_den_Reichstagswahlen_1930–1933_nach_Wahlkreisen

I dont know any of denmarks politics, but both can be true. The NSDAP was more or less democratically elected, MAGA as well

Best wishes and success from Switzerland!