All that is fine, and on some level I agree with you. On another level, they are football players and paid to play football. If they are healthy enough to play, they ought to play. If Tomlin says, "Well, if this was a playoff game, they'd play" they ought to play.
But here is the thing. Let's say they hold all those guys out as a precaution, and they lose. Will we have to endure all next week the wah, wahing over how Tomlin sucks? See, this is the perfect example of the no win he is in. He holds them out and they don't win, people biitch. He plays them and someone gets hurt again, even if they win, people will biitch. Oh, boy, if he plays them, they lose, and someone gets hurt worse, look out. If he plays them, they win, no one gets hurt worse, I'm sure there will be a timeout he either called or didn't call with about 47 seconds left somewhere that people will biitch about.