People didn't fight and die so that Das Reich could make his point. People fought and died so that this country wasn't run by those who share similar views to the likes of Das Reich. There is a big difference.
If you went around the postwar UK in 1945 calling yourself Das Reich, and wearing Nazi clobber, I'm pretty sure people wouldn't have been shaking your hand telling you they fought the war so you could carry on like that. That said, I'm not of the view he should have his name changed.
its about freedom - its about letting abu hamza use the human rights laws that he wants to fight against and destroy every day - that's the point.