Would you also sue the doctor if he/she failed to give your spouse immortality? "Find the person who committed crime X" is more like your surgery example: a ta

Would you also sue the doctor if he/she failed to give your spouse immortality? "Find the person who committed crime X" is more like your surgery example: a task law enforcement can often accomplish. "Protect everyone all the time" is as impossible for law enforcement as "grant immortality" is for doctors.