Two sports I love, auto racing and football, are slowly being neutered.
In drag racing, the tragic death of Scott Kalitta at Englishtown caused the NHRA to shorten the race distance for fuel cars from a quarter mile to 1000 feet. It was a good short term fix, but it's been two yeas now. To me, a drag race is a quarter mile. I'd rather see them slow the fuel cars down by reducing blower speeds, nitro/gas ratio (it's currently 90/10 nitro/gas, IIRC) engine displacements, etc., than shorten the distance.
Dan Wheldon's crash and death were caused in large part by a venue problem. You just can't run Indy 34 cars on 30 degree banking mile and a half tracks that were designed for NASCAR, where the cars run 40 mph slower and are not open wheel. The IRL should limit oval track racing to flatter tracks like Nazareth, Iowa, Indy (of course) etc. But I do love the night races on the high banks at Texas . . .
In football, the "defenseless receiver" personal foul confuses me. I don't know how a defensive back running at full speed can possibly know how to hit a receiver fairly. It's crazy. Yet we have to do something, given what we now know about the long-term effects of repeated concussions on the brain. But pro flag football is not the answer.