Snow making at Yellowstone Park

I was really surprised to read today on the LATimes website that Yellowstone Park is going to be using snow machines to make snow in the park this winter.  I guess I never thought about why in the world a National Park would even think about doing something like that?  Seems to me that the Park is supposed to be all about nature, and if it snows then fine, if it doesn’t snow, well that’s fine too!  But the article was talking about how making snow in the park would allow snow coaches and snowmobiles to use the park in the winter.  To be honest, I’m not so sure that is a great idea or not!  I don’t have anything against snow coaches or snowmobiles, its’ just something I never really thought about in the context of them being in Yellowstone!  What do YOU think?  I’d like your opinion!