This question is so old and so worked-over that I’m baffled people keep asking it (unless they’re just kicking anthills to watch the Christians scurry). There are no new answers under the sun. I was in a round-n-round on it several months ago. As simply an emotional point it has some power, but it has no real logical force. The question boils down to “Why didn’t/doesn’t God run the universe differently?” Or, more honestly: “Why doesn’t God run the universe like I would if I were God?” Of course, there’s no reason to believe that any human asking that question knows anything about running a universe anyway, so who the hell cares how they would run it?? (I expect they’d do a lousy job. If you actually run the thought experiment, you’ll see that creating a world without suffering may be harder than you think…)
Your choices are: 1) the universe is being run by somebody who isn’t you and is orders of magnitude more powerful than you can even conceive; or 2) the universe isn’t being run by anybody. Guess what? There is no empirical observation you can make that can determine which of these two possibilities holds. So, pick one or t’ other, but simply be aware that you’re doing so without objective evidence… And then stop asking people who’ve made the other choice to prove theirs.
Emotionally, I find option 1 to be more satisfying. When I feel grateful, I have Someone to thank. When I don’t like what’s happening, I have Someone to be angry at (if He exists He can take it, and – on Christianity’s telling of it – He already has). My problem with option 2 is that it if it’s the case, it would be irrational for me to be bothered by suffering, because “it” just happens and there’s no point to it and besides it took millions of years of suffering to produce me anyways so it’s a bit hypocritical for me to be all agin’ it now… I call that “the Problem of the Problem of Suffering”. I can’t muster up the stoicism, so instead I’ll have to stick with being thankful to and/or angry at Someone.