You haven't mentioned WW2 or the Japanese at all. All you want to do is blame Churchill.
If the Japanese had not invaded Burma, so threatening British India and forcing at least 1/2 million Indians to flee back home, then the strain on food supply would have been far less.
Exactly. While engaged with Germany, Italy and Japan, the British Empire actually peaked in terms of military power and capability. The final all-in cost of WW2 resulted in its eventual decline, however.
Hitler would have invaded Britain if he thought that he could achieve it with acceptable cost. That's why so much bombing was done in 1940 as troops and barges were readied in France. If Britain had been lost, then so would the empire. There's no need to complicate things too much. Churchill's immediate priority was the defence of Britain and he was right.
It's called war. If all these regretable events had not occured, would you be happy to accept millions more deaths that would have come with years more of it?