National interest is to do whatever will benefit your nation’s people. So I think that it was in the USA’s best nation interest to bomb Hiroshima and Nagasaki. Many more American soldiers would have died in a land invasion of japan if not for the atomic bombs. Even if the US came up with a very strategic invasion plan, the POW camps where ordered to execute all 100,000 prisoners if America invaded. Also the US was looking at alternative attack, but decided that the bombs where the most effective. They were doing studies to see which strategy and attack would have the least amount of casualties and fatalities. The bombings also brought an end to WW2 which if it kept going both sides would’ve seen many more casualties.