Not just uncaught murderers, there are a lot of people who have killed without legally being considered murderers.
People who killed people in accidents such as driving accidents or hunting accidents
People who killed in self defense
Soldiers who killed enemy soldiers
Executioners
Police officers who have killed on duty
Doctors and nurses who have made mistakes that accidentally killed patients
That’s just good practice in general. Everyone where I’m at rushes straight through medic school if they have the money/time, and it shows. They barely know how to talk to a patient, and then you’re throwing all the various blacktop training at them.