AMERICA, IRAN and NORTH KOREA.Which is the BIGGEST THREAT to the World?

1) America is the only country to exercise Atom Bomb on Japan twice. Currently, destroyed Afghanistan and Iraq.
2) Iran is said to be operative in Iraq and threatening Israel.
3) North Korea is threatening to South Korea.

Which country(or government) is the biggest threat to the world peace and how?
Update: Some of you say 'America saved millions by just killing 100,000+ by bombing Japan', which eventually ended the war.

I ask them if it was the only solution to end war, it could be ended by bombing U.S. twice. How'z that?
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