(The Japanese government in 2009 recognized that accepting such an apology would undermine the foundations of the US-Japan alliance. Just look at how the 1993 Apology Resolution has undermined the foundations of the State of Hawaii. -- Editor)
(USA Today, May 11, 2016: Why Japanese may see Obama's Hiroshima visit as an apology anyway)
From Investors Business Daily Oct 11, 2011 (excerpted)
Leaked cables show Japan nixed a presidential apology to Hiroshima and Nagasaki for using nukes to end the overseas contingency operation known as World War II….
One stop on his tour was Prague in August 2009. There he spoke of "America's commitment to seek the peace and security of a world without nuclear weapons," ignoring that before 1945 we lived in such a world and it was neither peaceful nor secure.
In November 2009, Barack Obama became the first U.S. president to bow to Japan's emperor.
Another stop on the tour was in Japan, where Obama in November 2009 bowed to the emperor, something no American president had ever done. It could have been worse if plans to visit Nagasaki and Hiroshima to apologize for winning the war with the atom bombs had come to pass.
A heretofore secret cable dated Sept. 3, 2009, was recently released by WikiLeaks. Sent to Secretary of State Clinton, it reported Japan's Vice Foreign Minister Mitoji Yabunaka telling U.S. Ambassador John Roos that "the idea of President Obama visiting Hiroshima to apologize for the atomic bombing during World War II is a 'nonstarter.'"
The Japanese feared the apology would be exploited by anti-nuclear groups and those opposed to the defensive alliance between Japan and the U.S….
read … Apologies Not Accepted
Full Text: Wikileaks Cable (see section 5 re: Hiroshima)
Related: TOJO WANTED TO IGNORE ATOMIC BOMBS
This Day in History: Truman Announces Hiroshima Bombing