I brought up this topic a year ago. While in japan, some japanese were drawing a map of Japan and they pointed out Hiroshima and Nagasaki. I think they were expecting a response of remorse from me. I didn't express this feeling. I felt at the time that the US was justified in dropping the bombs.
Since then, especially after 9/11, I just can't condemn one without condeming them both. We now know that the Japanese were already considering surrender at Potsdam. They wanted their emperor to remain in power. Something we allowed after dropping the bombs anyway. The main reason for dropping the bombs was to quell Soviet influence in Asia and possibly keep it at bay in Europe.
If I were in the same situation today, I would express regret for the bombings. America was the good guy in the War and showed that during the occupation. It is over, but just as the Japanese should remember the atrocities in China and the Germans should remember the Holocaust, we also should remember those bombings.