How do I miss thee? Let me count the ways...
I believe that this link [Link Broken] largely speaks for itself. That will not prevent me from speaking.
Quite simply I am not impressed with the dichotomy of telling kids they should go outside, do fun things with friends, and be social coupled with banning and deterring just about everything that is fun about outside. Swings? Someone could get hurt. Cops and Robbers? Someone might be offended. Education? Someone might start thinking.
Getting hurt is part of the human learning process. We don't learn to avoid the hot (and painful) portions of cookware by watching carefully reinacted, government sanctioned education videos depicting the unfortunate fate of someone "stupid" enough to grab an oven sheet with their bare hands. We learn by burning ourselves and dealing with the painful and inconvenient blisters.
If we aren't allowed to ever fall down, how can we learn brush off the pain, suck it up, and get done what needs doing? This isn't a slippery slope, this is a jump off a cliff.