There's a responsibility to the coaches, to the organization, to the front office, to the owners, to everybody who believes in you enough to give you what you've gotten, to the fans that show up every day and pay to watch you play - all those things combined. It's not fair to take a day off.
You never want to be in a defensive mode or have a defensive mindset. You always want to know that you're in control as the pitcher, you make him get hits, you're never passive, always aggressive. If I get beat, I want it to be because I got rocked, got hit hard, never because I walked a couple of guys and before you know it.
You can make a lot of cases that you can take the win stat out of the game and you can still figure out who the good pitchers are, and I agree with that to some extent. But there's something about your win-loss record, there's something about having wins by your name that means something. Regardless of how important that is.