It is best not to try to extend reasoning into realms of things in themselves--things that can not be checked by observation

The problem of evil is well known problem since ancient times. To give you an idea of the scope of the issue let me say there are more than 2 billion entries on this issue when you search google. Happy reading. And among these authors have been the deepest and most profound. So what I think is this: We would do well not to try to reason about spiritual things at all. We should mind our own plot of land and be happy with what we have and not be in the category of those that Do not  look at "what is above, what is beneath, what is within, what is outside." מה למעלה מה למטה מה לפנים מה לאחור/ The Gemara says harsh words about those that look at these. Now the problem of evil is hard to understand, but when it comes to the idea that everything that God does is for the good, we ought to accept the fact and just move on.

[What are "things in themselves"? When you look at a piece of wood it has a shape and a color and a feel to it. These are characteristics that describe how you interact with that  piece of wood. But what is it without your interaction with it? What is it without the adjectives that you add to it?"

So we might know about God, and morality, and souls and angels. But not by reason. Rather by Faith. And faith is important. However one should not confuse faith with knowledge. And when one does confuse these two things, that is where religious insanity begins.