He doesn't intentionally put people through suffering. He allows it to happen, however, when it serves His Will. How many of us would actually grow closer and trust in God if there was never suffering, no punishment at all for transgressions against Him, and everything was perfect? We chose to break the system, and God, in all His power, decided to allow us that choice. Anything that we get from this point on, given our fallen nature, given our choice, even our continued existence, is nothing but pure mercy from an Creator that could have given up on us long ago (at least in our temporal view).
For us to have freedom, He has to let evil happen. He has to let suffering happen. Otherwise, there is no choice, and there is no freedom. That freedom is both the most amazing gift and direst curse upon the human race. And make no mistake, he allows it to happen not only to provide a choice, but allows suffering because we chose it and continue to choose it. Just as when, if we do not choose Him, he will let us go to Hell. He did not create it for us, but if we choose it, we will go there.