So it’s come to this: General Motors, once the world’s mightiest industrial enterprise, is now flirting with bankruptcy. Ford and Chrysler may not be far behind. Car and truck sales have collapsed. With cash reserves rapidly falling, GM may soon be unable to pay its bills. Here’s the dilemma: GM and other U.S. automakers ought to be rescued to minimize damage to the economy, but the rescue should require tough conditions that neither the Democratic Congress nor the incoming Obama administration yet supports.