Seems like a good ruling to me. Reasonable and prudent behavior would have been to warn the family. Imagine if you were camping and a bear ripped apart your tent and dragged out the cooler. Now as you are leaving the campground, you see another family with kids setting up camp. Would you just walk by them and not warn them? What if you and your kids are playing in a park and see a cougar. Do you tell the other families or just leave? The park was collecting fees and regulation activity. To not disclose a known risk was, in my opinion, criminally negligent.