It’s spread to Wyoming, where the Game and Fish Department suggests hunting — sharpshooters in some cases — as a means of dealing with overly abundant ungulates (the white-tailed deer).
One could argue over what happened to allow deer herds to grow so much (as they have in Pennsylvania, Ohio, West Virginia and other Eastern states, greatly diminishing biodiversity, particularly flora, in the process).
But hunting remains the best and most sensible control method. You can read the Pennsylvania Game Commission’s current deer management plan here. And for an independent, conservation-oriented view of the whole shebang, you know what to do.