Those things are not in disagreement with each other. It could just be that the bomb was a selection event which selected people who have the best ability to re

Those things are not in disagreement with each other. It could just be that the bomb was a selection event which selected people who have the best ability to repair DNA, which protects from cancer-causing mutations in general. Plus, the specific amount of radiation that is protective vs. cancer would probably only exist at a specific distance from the detonation site. So, even if the study is 100% accurate and reproducible, in no way is it an argument for dropping more bombs. You can't throw away data because you think someone could theoretically use it to support a bad idea.