Why doesn't the pilot eject and let the plane crash? Is the plane more valuable than the pilot's life? (A damaged plane, no less.)
And it sounds like he was flying over water, which carries substantial risks in itself.
Not to mention, an ejected plane can now go hit some school or office building, whatever causing all sort of casualties. Most pilots would rather just try and survive the crash and risk their own life.
http://www.916-starfighter.de/SR-71_Waever.htm
He lived, his back-seater did not.
I recall seeing someone run the numbers, and it turns out that the guy in your link had it worse, as the much lower altitude more than made up for the lower speed.