They know it. They are enamored of the power and direction the nazis took. They see the nazi's system and methods as productive. That's why they mimic them.
In retrospect, I should have stated "NAZIs and they won't admit it." In reality, the NAZIs and Commies fought each other for control of the same minds.
Several years back, I read Liberal Fascism by Jonah Goldberg. In it, there was a section regarding someone visiting university students in the 30s. One year, the students all had Communist propaganda in their rooms, and were down for that struggle, and just a year later, all the Commie stuff was gone, replaced by NAZI propaganda, and they were now down with the NAZI struggle.
Two sides of the same statist coin.