It Can't be Helped Now....

I don't think that the US was wrong in bombing atomic bombs. 

It should have been a right decision that the US could make at that time. 

The problem is why then the US should have used atomic bombs: Is it because there was fear of the power of a giant socialist, the Soviet Union? Or, is it because then the President Harry Truman wanted to gain more support among then the American citizens? 

These reasons sounds true, but I can think up another reason for that:
the US wanted to succeed in the Bretton Woods system and needed to become politically strong enough to make their currency, dollar, accepted as the world currency such as gold. 

The US needed to be stronger than other political giants and so it should have bombed atomic bombs.