A little part of it is in everyone. Addicts continue to do what will eventually kill them because they think they can get away with it just "one more time." They always do eventually quit, but not usually on their own terms.
Sen. Bill Nelson of Florida wants just one more shot of the shuttle milk-blood. He's going to ask the next Emperor to spend "$300-400M" to get one last shuttle flight to ISS carrying Sam Ting's magic machine. He says the hardware is already available in the form of an extra external tank that is kept in reserve for a rescue mission. Since it would be the last space shuttle flight, and since the ISS is a safe haven, the rescue tank would not be needed and could be put to good use.
We love the contorted logic of addicts.
Ahhhhhh, Sen. Nelson, sir. Just how would you get that crew off the safe haven if that last tank happens to let go of its precious foam? Have you asked the Russians if they have three or so Soyuz's in the pipeline and ready to go on short order to save Ting's lambs? Maybe you'd rather ask the Chinese for help?
While we don't expect our Senators to really have a handle on what things cost or to balance our national checkbook we would hope that they would draw the line at trying to understand probability theory and its implications for human lives. That $300-400M could go towards making AMS a free flyer and for putting that last ET in the Smithsonian where it belongs. That makes a lot more sense than putting seven more bodies in Arlington.