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You raise some valid points about the rigors and risks of taking up marathon running.
But your problem is the same as Buckeye Tim's. You presume -- wrongly -- that many of these novices are not properly trained before entering marathons, but they are. The fact they may not have a shape or a stride as pretty as yours does not mean that they cannot finish the race, be they sprinters or staggerers. As a plus-sized runner myself (who has given it up for the most part due to joint stress, as you pointed out), I wouldn't dare try a marathon. But it's still a free country for those that do.
By the way, Oprah appears to be in substantially similar shape.
For those elite runners who agree with the author, I'd say this: If looking at these people offends your delicate sensibilities, then just pass them by, cross the finish line, and let the others stagger home. But give it a rest. You may be in impressive shape, but you're not Peyton Manning, Mia Hamm or Floyd Mayweather. You can run at a pretty good clip for a pretty long time. But don't pretend you're any type of premier athlete.
So, you self-proclaimed "warriors," mind your own business and let everybody else chase their goals, and maybe add years to their lives in the process. Run restricted competitions if you seek a taste of the good old days.
The fact that all of these fat, slow people are crossing finish lines all over the country doesn't diminish the marathon as a sport, it places it in perspective. Long-distance running is no longer the province of self-appointed elites whose only purpose in complaining about democracy coming to the sport is to validate themselves.