But SSQ has a point. When it comes to the use of deadly force...if in doubt, you don't do it. What I got out of the interview was a lot of doubt in Justin's mind. By his own words he's been second-guessing himself ever since. And judging by his words, I don't think he would do the same thing again. Resolving doubt after a traumatic event can sometimes be life altering.
Jodie is right in that most people don't know what they will do until the event presents itself. Shooting 'monsters' is clearly outside the response repertoire of most people.