The hippocratic oath is not legally binding. It never has been.
Yes, actually it is costing people. It's costing you. Have fun paying for your doctor's malpractice assurance because greedy pricks want to sue someone for not saving their life properly. Really, it's blind ignorance of medicine like this that is ultimately destroying the US medical system from the ground up; I bet you don't even know what conditions CPR actually has a chance in helping. I'll give you a hint: if someone's pulmonary circulation has outright failed, your CPR isn't going to do anything.