We need to have the right to defend what we have worked hard to obtain. When someone steals from me, he steals not only a thing, he also steals however much of my LIFE was expended in earning the money to buy that thing. I no longer think it immoral to use deadly force to protect MY property.
I can agree to this, although some may think its not reasonable. Any criminal who has decided to steal your possesions has broken the law, and who's to know if they won't do it again to someone else, and possibly injure or kill an innocent person in the process?
In the case of the original story, it seems the justice and law enforcement system has failed to do its job properly and left this man on a limb. I'm not sure of all the details, but IMO you don't treat a Veteran like that (all factors considered of course).