Evil is a necessary part of the order of the universe.
Has it occurred to you that transmigration is at once an explanation and a justification of the evil of the world? If the evils we suffer are the result of sins committed in our past lives, we can bear them with resignation and hope that if in this one we strive toward virtue out future lives will be less afflicted.
Evil can be condoned only if in the beyond it is compensated by good and god himself needs immortality to vindicate his ways to man.
There is no explanation for evil. It must be looked upon as a necessary part of the order of the universe. To ignore it is childish, to bewail it senseless.