It depends on the circumstances. If there is a threat of imminent serious bodily injury or death, then you are wrong in the above assertion. Most states laws will read similar to Utah: http://le.utah.gov/code/TITLE76/htm/76_02_040200.htm. If you read it, you will see what is legally required. There is a line between justified and unjustified and those who think they are willing to engage in self defense actions better know the difference. Murder is not the same as killing. Anyone who believes they are willing to use deadly force should familiarize themselves with the deadly force laws of their state. If you don't think you could take action with deadly force, then this is all a moot point. Hopefully it is a moot point period.