Why can't the hospital treat the patient first, do the surgery, and then let the patient's family pay?

If you are a doctor and you have a patient who can't afford to have an operation, you do it out of the goodness of your heart, and then after the operation, he says he can't afford it, and the worse ones run away directly, and you have to pay for the operation, will you agree to it? No one will sympathize with you at this time, and the so-called leaders will not help you. But also to tell you a point, as a medical student, I have seen too many trauma in the emergency internship to medical treatment, and so I helped him to deal with the wound did not pay for the people who left, dealing with a small trauma about dozens of dollars it is so little money to escape, not to mention thousands of tens of thousands of surgical fees, you may be dissatisfied with the hospital, you can say that the doctor did not have the virtue of medical treatment, see the money eye to eye, but this is the social system! But this social system is just like that. In other words, who can sympathize with doctors? After all, the number of doctors is small, the number of patients is large, it is always the doctor scolded, there is no patient error, you feel dissatisfied can go to court to sue the doctor, the doctor must also have to come up with evidence to prove that they are not wrong, or else it is a crime, in this case, you if you are still dissatisfied with the words, you can only believe that the party and the government will change you a fair. ~~~