I raise your hypothetical destruction three persons who engaged in all out Warfare, either against ones own nation or against one another, with thorough destruction and civilizational decline.

[0]https://en.wikipedia.org/wiki/Adolf_Hitler

[1]https://en.wikipedia.org/wiki/Joseph_Stalin

[2]https://en.wikipedia.org/wiki/Mao_Zedong

My assumption is that those scientists working on the bomb, where perfectly aware of what humanity was capable of (even with democracy and hightech) and decided to raise us this rockets as a monumental finger of "Never again or never ever after!". Way to go to tame a beast, who thinks you are a useful plaything. Well played Mr.Oppenheimer.

Rage all you want upon this monument of reason, erected against the intellectual treason you commit against the humanity that is- not the humanity you wish for.

The inferno of the first WorldWar, the Inferno of the second WorldWar, the various Colonial Wars and all the useless carnage before - these all started with a humanity capable of deducing deterrence, but true deterrence appeared first in presidential discussions after the existence of ICBMs.