To study history is often to study violence. The Nazis and the Holocaust are specifically fascinating because of the methods of violence involved: combinations of brutal and bizarre physical and psychological violence practiced on millions of people. This serves as a backdrop for the entire novel, but violence also raises its ugly head in the present, while the students are studying the violence of the past. Wave members resort to bullying and stalking when their "movement" is threatened. And since bullying and teen violence are not a thing of the past, Shmoop thinks they're worth talking about. The Wave can help us get the conversation started.
If physical violence weren't involved, The Wave may not have been such a bad thing.
The Wave doesn't take violence seriously enough. David should have had major consequences for what he did to Laurie.