Most RV parks do have you sign something but I've never read such a lengthy statement. But, most of us who travel long or short term realize the campground will not be held accountable for "damages" of any kind and do protect their own investment/liability...it's just the way it is.
Unless someone intends to harm someone, damage goods and doesn't pay attention to what's going on...are we going to lose sleep over it? If we think a resort or campground isn't safe or we can't keep from damaging their property then we have the right to leave and it's best to do so before we check in!
It's tough but that's life!