Can a wild baby bird's wing be fixed?

A baby sparrow ran into my leg yesterday and I did what I could. I've called around town and many vets don't want to take in this bird to mend its wing. One lady I called (who was very rude and blunt) said the birds wing cannot be fixed, that it will have to be euthanized. And sparrows aren't endangered so there's nothing that can be done. She also says it will starve to death. Is this true? Should I give up? If I do find a vet that will see this bird say the same thing? I thought that wings could always get fixed as long as there's a wing to fix?!