Though I am a supporter of gun ownership and the right to defend one's home, I do also believe this story is a bit stretched indeed. This guy was probably in his own right to self defense, but I do not like the way people say he's a hero or something.
He should have shot a warning shot. The japanese case mentionned above proves that honest mistakes can happen.
Also, what's stopping us to think that the guy was kind of happy of the idea that a burgler entered his house, so that he could enjoyed the manhunt and the kill? It's not as if the presence of a stranger in your house should give you a total license to kill. I'm ok to give the guy the benefit of the doubt, considering his advanced age (he probably could not think as fast as a young man) and all... But felicitations? Honors? I don't think so. Though it's not a crime, it's not really a good example either, as it is not the wisest use of a gun, to say the least.
« Hum, I haven't recently heard of this old man who lives nearby. Maybe I should check he's ok. Oh, the door is loose. "Mr xXXX??" Damned, Why am I shouting his name? I recall the old man doesn't hear anything. I think I hear some footsteps in the stairs. Oh, here he is! Hello.... hang on, what does he hold in his han.... BANG!! »
I haven't managed to read the entire thread, but saw this post, which I agree with.
I support the right to own and bear firearms. But, retaliation must be proportional. Killing so quickly does seem too much to me. He should have given some type of warning before shooting (warning shot is the best since that leaves evidence), or at least assuring himself the burglar was armed and represented a lethal threat.
I don't support what this man has done (if it really happened as described by OP's link)