we know Khan was all gumdrops and lollipops. He was a cuddly dictator.[*]
Come on, man. You aren't going to refute Jeyl's point by caricaturing it. And I don't think you genuinely need telling that there's a pretty large distance between "Hitlerite madman" and "misunderstood saint."
(It's already established in TOS that Khan and the other tyrants killed in war... and also that Kirk and McCoy regard him as less bad than the others for fighting only when attacked. As has been pointed out, it is genuinely pretty hard to get around stuff like that if you want to argue that Space Seed was in fact portraying him as Hitlerite Evil.)
* For comedic potential, though, I have to admit that the "cuddly dictator" notion does bring a rich trove of Khan parodies to mind. What if the shameful secrets of Khan's rule were Cuddly Secrets? His passion for fancy pastries, his love for unicorns and Pokemon, his top-secret Kitten Defense Fund... the Cuddly Khan Comic practically writes itself.