You can elevate the lives of the Japanese civilians; the innocent women, children, and elderly who died in Nagasaki and Hiroshima as being more important than any other innocent civilians throughout Asia and the Pacific Islands who died anytime from 1937-1945.
This is what most people do when they take your position. The sympathy for those civilians who died in Japan, and the ignorance of the actual numbers (millions, not hundreds of thousands) of the civilians who died at the hands of the Japanese will work in your favor.
As you can see by an answer already given here, most people do not think or look any further into the war and the lives of the innocent civilians taken by the Japanese. This sympathy/guilt plea is highly effective!