In nature, diseases have their role in thinning herds and renewing forests. It is not seen as a horrible thing, only as part of the whole process. But people want to stamp out all diseases so everyone will live forever. Can you imagine a world where everyone lived forever and ever? It will get crowded fast and the inevitable result will be disease from overcrowding.
People fear death and disease and want to stamp out everything that’s uncomfortable and create a world where nothing ever goes wrong. “Wrong” in this sense is what doesn’t fit into their fairytale idea of a perfect world where there is never any pain and nothing decays or passes away.
But people on a spiritual path do not fear disease or death. They know they are Eternal Souls. Nothing can kill them. They are not the body, which is a combination of water and a few chemicals. There is no inherent life in the chemicals, only the Soul within.
Disease can be a great tool for learning how to overcome suffering. It can bring the spiritually minded person closer to understanding ways of self-healing. Being eternally free from disease is not really freedom at all. Being free from suffering is another story. We can face the pain and divorce ourselves from the suffering—that is possible and many have done it!