“Why do I have pain? If God is truly good, He wouldn’t allow us to suffer” Neat observation. How about when we hit the wall with our head, is that pain also God’s fault? No, you won’t claim that because you understand the true cause of the pain (you hitting a wall with your head). So when it comes to all other pains in the world, just because we lack the understanding from where the pain is originating it doesn’t mean it’s unfair. It just means that we can’t remember, due to the memory cleansing during the reincarnation. All pain is there for a reason, to remind us who is in charge.