That is a totally spurious argument for a number of reasons. 1) Pistorious is genetically predisposed, regardless, from the knees up, to a higher than average level of fitness, muscle density, metabolic efficiency, etc (all successful athletes are almost by definition, since to be successful, you have to compete with people who do have all the genetic advantages AND the will to win, either alone is not enough) 2) he actually has an advantage over "able-bodied" athletes in that if he twists his ankle he doesn't need to take 6 weeks off training to heal, he just swaps in a new one.
What Pistorius has done is redefine what disabled means. He's not actually disabled at all, he's superhuman, quite literally a cyborg. For the Olympics they slowed him down by reducing the springiness of his, err, springs, so the poor humans could keep up.
As for the others, you could train as hard as Phelps but guess what, it wasn't training that gave him his flipper-like feet or his extraordinary armspan.
I don't want to get in that discussion, the point is the guy had no legs, yet he just competed in the olympics. He was clearly in your "can't do it" group.
And forget Phelps, Bolt, etc. They are one in a billion, and the greatest athletes of all time in their field. What about the other 99%? What's the excuse for them?
What Pistorius has done is redefine what disabled means. He's not actually disabled at all, he's superhuman, quite literally a cyborg. For the Olympics they slowed him down by reducing the springiness of his, err, springs, so the poor humans could keep up.
As for the others, you could train as hard as Phelps but guess what, it wasn't training that gave him his flipper-like feet or his extraordinary armspan.