If you look into this, you'll find the rumors regarding "talks of surrender" are greatly (and cleverly) exaggerated.
After Hiroshima, the Allies requested a surrender. Japan surrendered. The allies rejected the surrender (unacceptable terms). Nagasaki was nuked. Japan revised their terms of surrender. That one, still with terms, was accepted.
Which of those sentences are false? If none are false and they are in chronological order, the US committed mass murder to negotiate better terms of surrender.
However, if you study the military history, you'll find the reality is that Nagasaki was a major sea port and industrial center (including the Mitsubishi Steel and Arms Works), making it unquestionably a military target.
And it made the torpedoes used in Pearl Harbor. If it were hit in 1942, it would have undoubtedly been a military target. But hitting a civilian manufacturing town (even if the civilians were manufacturing implements of war) just days before a surrender, and after talks of surrender had started makes Nagasaki more a terrorist act than Dresden, which was thought quite poorly of at the time (by both enemies and allies).
Hiroshima nuking killed about 20,000 troops. Nagasaki nuking killed less than 200 troops. Two orders of magnitude. The Nagasaki bomb wasn't intended to weaken the military's ability to fight, but was intended to weaken the public's will to fight. One is a military goal, the other terrorism.
Neutrinos have bad breadth.