The allies won the war by conducting terrorism of the largest level in human history. That might have been the only way for them to win. I don't think anybody here is a better general than Eisenhower or McArthur was, to be able to suggest a better way.
All sides of WWII were conducting outright terror attacks on the civilians of their enemies, with the allied terror bombings of German cities and terror nuclear bombings of Japanese cities being the most devastating of these.
