People are very quick to thank God for every good thing. It seems logical, then, that He should also be thanked for all the bad things. And there are a lot of bad things in this world. This website presents a partial list of them.
For you Atheists who are in-the-closet Agnostics. Or for the Atheists who just respect Agnosticism. Whatever. "We are all ignorant. The thing that sets agnostics apart is that they aren't ashamed to admit it."