The radiation fueled SUPER ANIMALS that could be bred there would make hunting a little more challenging.
As pictured below: 
This is silly. I work for one of the contractors that is cleaning up the joint.
When our company took over the contract, we had some public Q&A meetings. A bunch of enviroweenies showed up. It was announced that we would be cleaning up Rocky Flats a couple of years sooner than what the gov't recommended (basically saving thousands of taxpayer dollars). Environweenie then asked if we *really* needed to clean up the site that fast.
These people have made livings off of protesting this site - their actions don't really benefit anyone. They just whine and get paid for it.
The radiation fueled SUPER ANIMALS that could be bred there would make hunting a little more challenging.
As pictured below:
There's one place I won't be recreating at. People shouldn't go there.