This ran enormously against Einstein's own pacifist inclinations, though the possibility of the Nazis acquiring such a weapon before the US had forced him into warning the government of the dangers of this occurring.
You end up sort of coming back to a weirdly pacifist platform, which is not, I don't think that's actually the ideology of the people that are making that point.
After the Americans devastated two Japanese cities with nuclear explosives, Albert Einstein returned to his normally pacifist views, speaking out against weapons of mass destruction and war in general.