What about aggressive childhood leukaemia? Why does God do that? Genuinely curious to understand.
The annoying bit is that the Christian answer to this question sucks from a rational viewpoint - we humans cry out for our own justice against this God that allows such suffering.
Just be mindful before you assume that Christians are completely crazy, that for from our viewpoint God suffers as well - not only does he love this child, but he also died for this child - in order that all of us could be drawn to him.
The Christian term for this suffering is his "passion" - in that he longs to be with each and every one of us as an individual.
It really seems that from our viewpoint is would seem so!
The Christian viewpoint is that suffering will be redeemed - God promises us that he will "wipe away every tear from their eyes" (Revelation of St. John 21:4)
As Christians, one of the problems that we create is that we try to make all "make sense." We can't - because we don't have the full picture. As such, I have to apologize that my answer for the problem of evil isn't satisfactory.
Here's a good overview from a theological and rational viewpoint:
(as does the flying spaghetti monster, the tooth fairy and santa)