The issue is, "If God is really who He claims to be, how can He let this happen?" the question is valid. The same question applies to parents losing children, disasters, sickness, any bad thing. God is Love. God is Good. God is all powerful. God is all knowing. If He knows some bad thing will happen, has the power to stop it and doesn't intervene, He becomes basically culpable. He is not Good, and this is not what Love is.
The issue drives Christians crazy, and they have a zillion ways to excuse, defend and support their faith. Most of them make no sense at all, and some are just funny.
I have a tendency to oversimplify everything. My simplistic resolution to the question is that God never promised stop all bad things in and around our lives. He promised to walk through those times with us. He promised to use even the worst things life can throw at us as opportunities strengthen and deepen our relationship with Him (and His with us).
Like the trailer park scoffers from two days ago, many scoff at the concept. For those people, there is no benefit to God. Their life is what it is, and nothing more. I'm sorry for them, but I honestly don't blame them. I think that is the wrong conclusion, but everyone has the right to reach the conclusion they are comfortable with.
For me (and countless others whose well documented stories are much more interesting than mine throughout history), I know that the bad times in life are already redeemed by what Christ did. The peaks and valleys in life are equal opportunities to experience God's presence, wisdom and power - even if the valleys are very deep and treacherous.
In this way, all things work together for Good (for God) for those who trust in the process and believe in the higher calling of the destiny and purpose He promises. Nothing is meaningless or incidental to that process, and every situation we can ever face in this life becomes a 'teachable moment' in which we learn more about Christ, personally and individually.
And honestly, a healthy separation from all of the stuff we accumulate, mansions we build and empires we think we control is not a bad thing.
So does God do bad things to us to teach us? Nope. Bad things happen and good things happen, to those who walk with God and to those who don't. That part of life is part of creation. Cause/Effect is a powerful part of that creation. Random events are also part of it. They happen to everyone, and the difference between people of faith and people without faith is in how they respond to each episode that life presents.
My working theory is that those of us who focus on our God will always be able to process, overcome and benefit from bad events in life better than those who deny God's existence at all. As a Christian, no matter what I face in life, I can say, "I know whom I have believed in and am persuaded that He is able to keep that which I've committed to him against that (or any) day."
That's what it is to be a Christian.