I didn't actually read all 5 pages, so I don't know if this has been addressed, but even H, or S rated tires can physically handle those speeds, but they are not guaranteed. It takes something like a few hours at 250km/h for a lower-rated tire to begin exhibiting premature wear.
Running a tire at its speed rating is usually safe for continuous hours on end. I had W-Rated summers on my last car, and I don't think I ever took them over their speed limit, but my H-Rated winter tires saw 250-270 several times (on the track), and never had any problems.
Now having said that, while I agree that a hazard in the road could prove dangerous, I will have to make the argument that it is not much more dangerous at 200+ than it is at ~100. I have hit some hazards in my time, and unless you're coming around a sharp enough bend, they'll usually just do damage and not cause a loss of control.
Even on a 1.3L mitsu lancer in Egypt, circa 1999, had two tires blow out at 160km/h (with 13" rims and some extremely narrow tires, so it felt like 240), not even the slightest loss or difference in control.. Just pulled it over, and was glad not to be injured.
More recently, I was in my volvo and hit a massive crater of a pothole on the 401, was driving with the flow of traffic, couldn't avoid it. Dented all 4 rims, destroyed a tire and one of my shocks. Again, no loss of control.
Pretty much the only thing he could have hit and caused damage at that speed would be a spike strip. Sorry bear, but your example about the Concorde is pretty irrelevant here.. Notice the chain of events in your story... That's like saying, he could have hit a nail that shredded his tire and caused it to smoke into and rupture the vehicle's gas tank, causing an explosion.