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.
Carefully watch your thoughts, for they become your words. Manage and watch your words, for they will become your actions. Consider and judge your actions, for they have become your habits. Acknowledge and watch your habits, for they shall become your values. Understand and embrace your values, for they become your destiny.