IF THE KID FELL OUT OF HIS TREEHOUSE (which would still be tragic and the kid would still be dead), would you be calling for a humanitarian effort to outlaw ladders? What about all the people that like and use their ladders? You get the point?
How about those "yard darts" people used to have a decade or so ago (and which may still be on the market). Think of your average dart and make it about .3 meter long and about 1 kg. People actually TOSSED these to each other. WTF? Would I throw these across a field to my friends? Would I STAND THERE AND TRY TO CATCH ONE?
I'm beginning to suspect that more people are injured annually with fireworks than firearms. You can see how well legislation is at controlling fireworks.....
