This is my fourth German film and I'm digging them. Because you asked, I watched "Das Boot," "Downfall," and "Run Lola Run."
I thought "The Wave" was going to be corny. I thought it was going to be about a group of simple-minded kids following a leader because of some bromides. It wasn't that at all.
Rainer Wenger (Jurgen Vogel) was a teacher who was teaching a class on autocracy for project week. After a spit-fire discussion with the class about what autocracy is Mr. Wenger decided to do an experiment with the class. For project week only they would have to do what Mr. Wenger said. There were a few that resisted and left the class, but those who remained were all in. Slowly, we saw the evolution of a movement.
"The Wave" is the negative side of populism. I say that because the Wave, meaning the organization they formed, could easily have been something good. Mr. Wenger had his students doing very constructive and positive stuff. Who doesn't believe that there's strength in unity, who doesn't believe in equality, who doesn't believe in helping their fellow man? Plenty of organizations, religions, and movements purport similar beliefs and they are viewed as being good. It's when people use these goodly aims to form radical armies bent on purging, "cleansing," or otherwise harming those who don't think like them, that makes a movement into a gang. And if the movement is large enough to engulf an entire nation it becomes an autocracy.
"The Wave" gives food for thought. I think the larger lesson wasn't about being a part of something, I think it was about extremism. That very same group with more moderate participants could easily have been an asset to their school and their community. So I don't knock the Wave for its extremists anymore than I knock a religion for its extremists. Don't throw the baby out with the bath water.