Qooq, there's nothing stopping anybody from showing any exhibit in the US. I'm sure there are plenty of groups that would gladly sponsor such an exhibit if it hasn't already been around. They could probably even get a standing invitation to Berkley, CA.
A similar question might be to ask why Japan still won't teach any substantive W.W.II history in its classrooms? It would also be nice if Japan apologized for the enslavement of 'Comfort Women' across Asia. They've gotten close, but they just can't seem to say they're sorry. Not to mention an apology due combatant & noncombatant prisoners for the atrocities done to them...or to the family members of prisoners killed by the Japanese. The Germans in contrast were down right friendly to their combat prisoners.
Don't get me wrong, I spent nearly 4 years in Japan and loved every minute of it. The people were warm, friendly, and almost always welcoming. I look forward to returning again in the future.
Some people do have trouble putting the war behind them, on all sides. I have two acquaintances who were prisoners of the Japanese during the war. One was so starved (nearly to death) that he couldn't even leave his hospital ship bed in Tokyo harbor to view his comrades in the 20th Air Force as they flew overhead. Just a few ships over the armistice was being signed on the USS Missouri. He was lucky not to have been executed like so many other B-29 airmen. But he put the war behind him and returns frequently meeting with Japanese veterans and other groups.
The other former prisoner was a close family friend I looked up to tremendously while growing up. He refused to even allow me to send him post cards from Japan. For him, I guess the torture is something he could never let go of. He has since passed on and I regret that I never had the chance to take him back to Japan to see if he couldn't face down his demons.
My paternal grandfather was part of the Army forces waiting to invade Japan at the end of the war. Instead he became part of the first wave of the Allied Occupation Force, his memories are of a country in ruins. He really enjoyed the pictures I'd send him of a rebuilt Yokohama.
My maternal grandfather was killed in the skies over Germany in 1944.
What does all that mean? Nothing I guess. But Hiroshima and Nagasaki mean many different things - depending on who you were and what you were doing at the time.
But I agree, lightning is cool shit...as long as you and it maintain good separation!!