 The allies might not honourably prosecute the vanquished for such crimes when they, the victors, had engaged to multiple times a greater excess the same acts.Presidents Roosevelt and Truman supported LeMay's strategy, referring to an estimate of one million Allied casualties if Japan had to be invaded.Japan had intentionally decentralized 90% of its war-related production into small subcontractor workshops in civilian districts, making remaining Japanese war industry largely immune to conventional precision bombing with high explosives.