I don't think there's an economist on the planet that doesn't understand that the "auto industry" involves more than just the actual manufacturers.
The problem is, you have to establish the "event horizon"; at what point are you willing to pull the plug on these businesses, regardless of the repercussions to the economy? That's the question on many people's minds, and it results in a ton of political posturing. Of course a $25BB, or $50BB or even $100BB loan is a ridiculously low cost to save the auto industry (at this point in history). But what if it can't? THEN do you let them fail?