You can't hold everybody to the same standard. Some people are tougher than others. Brett Favre of the Green Bay Packers (NFL) hasn't missed a start since he began in 1992. He's played with broken bones, the day after his father died, after his wife was diagnosed with cancer, his brother-in-law was killed, with the flu, and with serious injuries to his knees, ankles, back and throwing hand. I think a professional athlete has an obligation, in a big event, to make a 100% effort to play to the best of their ability. For each athlete, what they're capable of varies.
"Fuck, fuck, fuck, fucking fuck, fuck, FUCK!" - Anastasia Myskina
"The noblest work of God? Man. Who found it out? Man." - Mark Twain
"Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." - H.L. Menken