Interesting question. I don't want to claim I have an answer, but I am reminded of an experiment that Bob Altemeyer mentions in his book https://theauthoritaria

Interesting question. I don't want to claim I have an answer, but I am reminded of an experiment that Bob Altemeyer mentions in his book https://theauthoritarians.org/ https://theauthoritarians.org/. They tried some United Nations simulations with people who he calls authoritarians (of which one trait could be described as subscribing to either with us or against us mentality), and the result was always a total nuclear war.