They need to be bailed out with the requirements that the UAW contracts are thrown away and the upper management is fired with no golden parachutes.
The Big 3 build good cars, they directly employ over 300k Americans which is far more than all the foreign companies combined in the US. Then there are over 3 million Americans work at their suppliers which would also go bankrupt and probably cut huge numbers of jobs. All of those people will be unemployed and now living on government money (unemployment, welfare, health care, etc). Toyota, Honda, Nissan, BMW all use the same suppliers for their US plants which would shut them down too. There are more job losses. And of course we would be importing more stuff from other countries, driving up our trade deficit, and being a service economy which cant make anything. Those companies and people pay taxes which runs the government, schools, police, fire, medical, roads too.