Broken legs and ankles heal better if you walk on them within weeks

It was hotly debated at the hospital, if my specific case should be operated on or not. Each time I had a checkup, one doctor would say "wait and see" while the other was saying "I can't believe we didn't operate on this".

At any rate, the outcome was as good as if they had operated on it, according to the doc anyway. Nice of them to test it out on me!

More related to this though, I have broken both my collarbones, the first time I had little direction and just held my arm still for 2-3 months. It took forever to heal, and my arm atrophied significantly. The second time, similar severity. I was guided through rehab and I was back using my arm within the first month, very little atrophy.

But trampolines and mountain biking are both activities that result in ephemeral injuries. There is the rare case where a particular injury might become chronic, but how is that a drain on society, and not primarily the individual?

by your logic, should we also ban (or require insurance?) for football (hand egg), boxing, martial arts, (Tai chi?), cars, religion, guns, knives, prescription medicine, children, leaving your house at all?

edit; I'm happy to steal more ideas from sibling comments! I already stole football, but now I want to add obesity, and all mental health conditions.

I'm really curious about the context the idea of net negative comes from, but I probably should also take a stab at a conclusion; why contrast individual actions and decisions in the context of society at all? The decision to do anything should stop at 1st order, and maybe 2nd order effects. That is to say, when trying to improve society, it's fair to look down into smoking and say, we should spend attention on fixing this. But it's incorrect to look at an individual decision "should I smoke" and weight it's effects on society. (How will this effect my family, or my environment is 2nd order, and should be accounted for)