Should every American watch the Nazi propaganda doentary Triumph of the Will?

Yes. You should watch it as well. You will learn how bullying fearmongers violently pushed their way into power. Hitler wouldn't have made it into power without the brownshirts. You will learn how laws that encourage neighbors to turn against neighbors, much like our Patriot Act, use "patriotism" as a rallying call for war and hate. People should have watched it 8 years ago.