Why is superstitious behavior always common?

Superstition is a word that only exists in China. People always have faith, live in groups, are afraid of loneliness and want to rely on it. Nine times out of ten, life in this world is unsatisfactory, but what you can see and touch in reality can't help you at all, so you need a spiritual pillar in your heart, even if it has no practical effect at all, at least it won't hurt you, that's all.