They'll say it's part of the deal he made. They'll say that he can spout bumper sticker philosophies like "don't be cynical" all he wants, but when you're in his shoes, you can afford to be gracious.
Hank Stuever in the Washington Post joked that Conan was aiming for Oprah's job when he urged fans to take the high road with him:
I hate cynicism -- it's my least favorite quality and it doesn't lead anywhere. Nobody in life gets exactly what they thought they were going to get. But if you work really hard and you're kind, amazing things will happen. I'm telling you, amazing things will happen.
But it doesn't matter that he walked away with a huge payday. He could have said anything he wanted. He could have ripped Leno. He could have criticized NBC. He could have been caustic and bitter.
But instead, he's grateful for what he's had, and grateful for the opportunities he has received.
I'm trying to figure out how to embed the video into this post; but for now, here's the link to Coco's gracious exit speech.