Why save all three of the automakers?

As we watch the Big Three CEOs and their staff parade through Washington asking for help why are not we considering saving two out of the three automakers? I know that the way Paulson helped his former buddies at Goldman Sachs letting Bear Stearns, Lehman Brothers and even Merrill Lynch disappear as independent entities was pretty weak. But having said that it is also the case that the survivors have less competition and are therefore more likely to survive. The American public seems to be divided into the buy American crowd and the rest of the market who tends to go for foreign cars. It should be clear to all of us that if GM say, goes, Ford is likely to do much better. So one not let one of the three fail and make the other two stronger?