There's nothing easier than firing a gun. Point at something, pull a trigger, and a bad thing happens to that something. Throughout human history, if one person wanted to kill another, they needed one of two things: the element of surprise, or a physical advantage (size or skill). The invention of the handgun has rendered both of these factors irrelevant. Now anyone can kill anyone else at any time by just pulling a trigger. So why do console controllers make it so difficult to do in First Person Shooters?