Chasidut zu Wajikra 20:2

On the subject of wars between nations and needless bloodshed, the Rebbe said, “Many of the misguided follies which people in previous eras believed in, such as primitive cults like child-sacrifice to Molekh (Leviticus 20:2) and so on, have now disappeared. But so far, the pursuit of war—misguided error that it is—has not been abolished.” The Rebbe had contempt for the scientists who developed new weapons, saying, “What great sages they must be to figure out how to make a wonderful weapon that can kill thousands of people at once! Is there anything more foolish than to kill so many people for nothing!”