There is a reason folks on the left say "fascists get the wall." There is a reason it took tank divisions to stop the 3rd Reich. Even if and when you start piling up dead nazis in ditches they are not going to "come around" - they are going to retreat into the shadows and wait for another chance. Which is exactly what they did after WWII. The best you can hope for is making nazis afraid again. You will never CONVINCE them that they're wrong because the reason they turned to fascism is THEY KNOW.