Ask me and I would say almost all suffering and experience has a purpose and a potential lesson to be understood, vices, religion and spirituality etc. If you believe in drugs, Karma or a God, as a form of spirituality, etc, you would probably have imagined the possibility of group narcissism and misguided interventions being the reasons behind certain suffering, so religion would naturally be the next big step, to try to convince everyone to be of one mind.