Many people write me complaining that they don't understand the logic behind what Hashem is doing, either to them personally or to their particular group or nation.
Why do you fly on a plane without knowing how a jet engine functions? Simple - it gets you where you want to go.
Try flowing with Hashem - He'll get you where you need to go.
I'm delighted that I don't understand Hashem. I'd be in a really tough situation if I had a god that I could understand, for if I could understand such a god, that would mean that his mental prowess is as tiny and as sorely limited as mine.