Unethical it might have been, but I'm still not prepared to put Churchill in the same park as Stalin and Hitler. They both systematically killed millions for purely political ends, not just military convenience. Churchill also stood up against Stalin who wanted to mass execute civilians as an example, he said "let me be the first one".
That said, I'm afraid this didn't help Churchill's cause after the war, and must have encouraged India to believe they could govern themselves better. They were in for a nasty surprise though.
So it is more acceptable that multiple thousands (some claim up to 1 million) of Indians die in order for Britain to have a surplus of food?
I hate to be the one that says this but if there is any one man in history that single handedly destroyed the "Empire" it was Churchill, his lunacy throughout WW1 cost it the Dominions and what he didn't sell the American's in WW2 left because of his colonial policies.
If you look at several of Churchill's quotes I think it more likely that given a free reign he could easily have matched Hitler but probably not caught Stalin...
"I do not understand the squeamishness about the use of gas. I am strongly in favour of using poisonous gas against uncivilised tribes." -- Writing as president of the Air Council, 1919
"The unnatural and increasingly rapid growth of the feeble-minded and insane classes, coupled as it is with a steady restriction among all the thrifty, energetic and superior stocks, constitutes a national and race danger which it is impossible to exaggerate... I feel that the source from which the stream of madness is fed should be cut off and sealed up before another year has passed." -- Churchill to Asquith, 1910
"You are callous people who want to wreck Europe - you do not care about the future of Europe, you have only your own miserable interests in mind." -- Addressing the London Polish government at a British Embassy meeting, October 1944
"One may dislike Hitler's system and yet admire his patriotic achievement. If our country were defeated, I hope we should find a champion as admirable to restore our courage and lead us back to our place among the nations." -- From his Great Contemporaries, 1937
"It is alarming and nauseating to see Mr Gandhi, a seditious Middle Temple lawyer, now posing as a fakir of a type well known in the east, striding half naked up the steps of the viceregal palace, while he is still organising and conducting a campaign of civil disobedience, to parlay on equal terms with the representative of the Emperor-King." -- Commenting on Gandhi's meeting with the Viceroy of India, 1931