I'm definitely not an expert on this but I think India has (well-grounded) resentment towards Churchill, and so the enemy-of-my-enemy effect may have resulted in a softening of Hitler's image and a tendency to downplay his crimes and negative attributes.

Nuance is hard, and so to some people, accepting Hitler as a villain means whoever defeated him must be a hero, so if we don't want to accept Churchill as a hero then we must reject Hitler being a villain.

(It goes without saying that this logic is faulty, but at the same time it's part of human nature and we all have to grapple with it to some extent).