I don't see how running max sidewall is overinflated either. The people who made and spent thousands of dollars in research of what their tires can handle are wrong and the guys at some news station are right? give me a break
If anyone wants to know how safe it is to have your tires inflated 5psi over the limit, come with me and I'll show you how safe it is. I'll drive though potholes that bottom out the suspension, I will take roads you thought were chocked full of nails and I will take turns that make you think the tires that have "less grip" should give way.
Did you ever notice that when people do auto-cross (and if you don't know what that is you shouldn't be preaching about how unsafe over inflating your tires is) Pump up their tires to or over max sidewall? They take the tires to their breaking point, taking turns on a dime and making them heat up way more than you will driving down the highway. Do their tires bust? no, do they cause them to loose traction and spin out of control? no, because the tires provide stiffer sidewalls for better cornering and more steering response. Something under-inflated or factory inflated tires couldn't do.
Oh, and FYI, the tire rating on the door is there as a compromise between a Cadillac-like smooth ride and a rough sports car-like ride. Most people won't be driving the tires to the max, so they go by a more comfortable, bump-absorbing pressure.
Cops inflate their tires to max sidewall for best performance. If it were unsafe then cops wouldn't inflate them like this and then drive in a high-speed chase.