The same reason it won't rain here in mid-Michigan. It's simply our turn to have drought. Other parts of the country have been much harder hit, so even though it is distressing, it could always be worse. I'm worried about my crops too, but worrying won't change things. I'm trying to remember what a good year last year was, and that there will be more good years in the future.
There is no rain because those are the climatic conditions in the area at the time. Other areas have also been hit hard with the hot and dry weather that has seen many crops and even livestock in many parts of the world. There are climatic differences in different locations and the weather forecasts should alert you on any changes you should expect. Some people in Evansville have even thought of seriously having a rain dance.