well said - I think there are enough troubling recent events that show that running is no panacea, especially in the face of serious illness - so anyone who is doing it in the hope of a guarantee of health shouldn't kid themselves.
However, life is a giant crapshoot and I favor the odds on the running side, even if it is to excess. Also, everyone should have the opportunity to indulge in excess in their youth. If the byproduct is health and longevity, then well done! However, I've seen enough older runners that don't look much better than Earl Campbell does now to know that there will come a reckoning for most.
Finally regarding all the back and forth over Kenneth Cooper and those who peddle advice, people should realize that medicine is somewhere in the hinterlands between the social and natural sciences. I would compare it to chemistry in the days before Mendeleev. The human body is so complex and people are so varied - how could you possibly dispense advice like "take antioxidants if you run" and have it apply to everyone?
Medicine is a crapshoot of a different kind - we take calculated risks all the time. Vaccinations and other preventative medicine just involve trading one set of chances for another more favorable one. Someday, we or our descendants will read Cooper, Atkins, Pritikin with the amusement that we now have for 19th century medicine - female hysteria and health massages and all that.