Belief in soul is the cause of all the trouble

“Buddhism stands unique in the history of human thought in denying the existence of such a Soul, Self, or Atman. According to the teaching of the Buddha, the idea of self is an imaginary, false belief which has no corresponding reality, and it produces harmful thoughts or 'me' and 'mine', selfish desire, craving, attachment, hatred, ill-will, conceit, pride, egoism, and other defilements, impurities and problems. It is the source of all the troubles in the world from personal conflicts to wars between nations. In short, to this false view can be traced all the evils in the world.”

Ven. Dr. W. Rahula, "What the Buddha Taught"