So, is mortal life an inoculation? In which we are subjected to evil (temptation, weakness, etc.) so that we can gain the ability to be inoculated from evil through the eternities.
That doesn’t mean that we seek out evil to experience it (remember the injection of the disease is a weakened strain – otherwise, we would be overcome by the illness and quite possibly die.) I simply mean that here, there are experiences, choices, etc. that we could never learn in all of our eternal existence, except by coming here.
Also, the antibodies that will fight and overcome the disease can only be found in the gospel of Jesus Christ and through His magnificent Atonement.