The answer is that there is no good answer. So as parents, as doctors, as judges, and as a society, we fumble through and make decisions that allow us to sleep at night--because morals are more important than ethics, and love is more important than law.
I am responsible. Although I may not be able to prevent the worst from happening, I am responsible for my attitude toward the inevitable misfortunes that darken life. Bad things do happen; how I respond to them defines my character and the quality of my life. I can choose to sit in perpetual sadness, immobilized by the gravity of my loss, or I can choose to rise from the pain and treasure the most precious gift I have ? life itself.