So, yesterday in Japan Obama was asked what he thought about the decision to drop?

the bombs to end the Second World War. So why can't he ever give a direct and clear answer? He was asked TWICE and both times he rambled on about "future Nuclear progress" and tried to change the topic to North Korea. So, why is he the ONLY President since 1945 not to answer clear and affirmative that dropping the bombs saved countless Military and Civilian lives on all sides?