Hospitals are places to cure diseases and save lives. Why do people keep dying?

Admittedly, the hospital is a place to cure diseases and save lives, but it also depends on what disease the patient has. If they have malignant tumor, myocardial infarction, sudden massive cerebral hemorrhage, severe brain trauma, neck trauma, etc. Sometimes they die before they are rescued. Should the hospital be blamed? Everyone's ideas are right. If you are sick, you should go to the hospital at once, but doctors are human. He is not a god, and there is nothing he can do about the above diseases. So for those who can't come back to life after being sent to the hospital, there are no dead people in the hospital.