Deer Valley is without a doubt the most dangerous resort in North America. The primary reason is that they groom a lot of relatively steep terrain; this lures people who can't really ski onto slopes beyond their ability ("Hey, it's a groomer") and turns them into uncontrolled missiles. A secondary cause is the "Master of the Universe" syndrome. Many of the gapers that frequent DV are successful in their careers and well-off. They assume that this achievement translates into awesome ability in everything they do, including skiing, despite all evidence to the contrary.
I have seen more serious accidents and fatalities at DV than anywhere else I have skied. Forget about out-of-control snowboarders, nothing compares with a 55 yr old CEO who can't ski, but thinks he's Ted Ligety, trying to impress his tart of the day on Stein's.
Ouchy…someone's jealous they can't ski DV. Even the local PC season passers treat themselves to a lux day at Bambi Basin every now and then, no boarders, the cushy lifts seats, the great beaches, the FOOD, the boulevard skiing. I like the longer runs at DV vs. the shorter ones at PC. And plenty of steeps and trees to challenge yourself and get a workout.
Don't think you'll find accident stats any worse for DV than for PC.