That's where the Hippocratic Oath comes in, I think, and why doctors can't (or shouldn't) simply stand by and let their patients die as long as there's something that might still be done. That's why the paramedics worked on my Sam for over an hour to resuscitate her, managing to restart her heart once before losing it again, they told me they worked far longer on her than they've ever done with any other patient.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'