What is the decisive factor of war?

When I was a child, I heard that the decisive factor of war is people, not weapons. At that time, I was puzzled: how can people decide the outcome of war, not weapons? Man has no weapons, but he is meat, which is different from an empty-handed animal. How can he defeat the enemy with a weapon in his hand? But I didn't dare to say it at that time, because this theory was invented by a great sage who defeated Chiang Kai-shek's 8 million troops, and the achievements of others were there. Facts speak louder than words. At that time, anyone who dared to doubt his old man's words might be regarded as the remnants of Chiang Kai-shek's stay in the mainland. I didn't expect to read the newspaper today and read this sentence again: "I think the decisive factor is not weapons and equipment, but … people" in order to win local wars under high-tech conditions in the future. God, at this age, you still give these leftovers to people. Why are there always some people in China who are not motivated? What is the man with no weapon in his hand? Isn't it just a flock of sheep, a flock of pigs, and a group of animals that are arbitrarily driven and slaughtered? How did a truth that even primary school students can easily understand get to "our boss" and become a century-old problem? We know today that nuclear weapons possessed by human beings can destroy the earth at least 10 times and 20 times. Faced with such a powerful force, what "decisive factor" can human beings have? It's been decades, so why study the war against weapons and people? We are about to enter the space age, and we will meet in a wider high-rise space. Why should people and weapons be completely separated to talk about winning or losing? No matter how advanced the weapon is, it will be a pile of scrap iron if it is given to a group of idiots; If you have the spirit of not being afraid of suffering or death, if you rush up with your bare hands or with a spear and broadsword, you are a fucking idiot! How can these little truths, which even primary school students understand, not turn around when they reach some adults?