They're not saying the Nazis are truly evil at all, they're just saying that the British people shouldn't have fought the Nazis or were hoodwinked by the govt.

The British were evil, the Chinese were evil, the Japanese were evil, the Belgians were evil, the Spanish were evil, the Incas were evil, the Mongols were evil, the French were evil, the Iroquois were evil, the ancient Egyptians were evil, etc etc etc.