I just read your article re Murder Could Happen to You. What is scary is that we don't know who we are talking to or traveling with. Some of the real life killers have looked like someone who could be a neighbor or friend.
The movie you write about shows how any one of us can get into a situation that challenges our moral and ethical beliefs. Under certain circumstances, we might consider (or have to) murder if it came to saving a loved ones life, or our own. Fascinating article!