I don't know anyone who's suggesting that burglars are a 'nice bunch of people', only that its not worth it to just kill them on the spot with no other justification than they were stealing your stuff.
I certainly wouldn't react to my house being burgled in a violent way because I'd probably get stabbed or something and come out of much worse than a few possessions being nicked.
Then if they see you, decide witness's are bad and come after you, what then.
THe point is seriously think about if you really wanted to rob your neighbour, think like a robber, think about what you'd consider before even deciding to do it.
If I was going to rob someone and didn't want to go to jail, obviously you try to do it when no ones home, although in lovely england we actually have a very very high percentage of robberies commited while people are in the house. If someone comes home while you're there what will you do, to pretend the majority of robbers have never even come up with these questions is ridiculous. For me, if someone found me and I had the choice of lying on the floor and giving up, going to jail and getting bummed, I'd choose to hit/attack whoever tried to stop me getting away. Pretending that most robbies haven't decided the same thing is ridiculous.
My point is, killing might not be a justified response to someone who was truly willing to give up should he get caught and never harm a fly, but killing is no where near overkill when you consider the burglar almost certainly went in with the intention of violently assaulting anyone that got in their way. The majority of burglars ARE the latter, seriously how many situations can you come up with when thinking about robbing someone to guarentee not having to hurt someone to get away.
The other problem is you simply can't possible know which burglar who walks into the room you were hiding is, is. He might give up in 5 seconds, but in 5 seconds he could be pulling the trigger that ends your life. Considering the fact the homeowner in most situations has no possible idea what the person who broke into the home is willing to do or capable of its rather harsh to limit what they can do to protect themselves.
The burglars have all the protection they need, but deciding NOT to commit the burglary they are completely and utterly safe. The burglar brings everything on themselves by making the decision and why anyone else should get the blame for his choice is a joke.