I know exactly how you feel. In my line of work, almost every decision I make will impact on someone's life. There are many times when I feel that action should be taken, or action should not be taken, however the evidence I have points in the opposite direction. It's a huge conflict, and one that usually ends up in a big argument with my superiors. Often I have to choose the course that I don't want to take, but it's something that you get used to.