You guys are forgetting something, they'd still be alive if they didn't break into his house. Far as I'm concerned this is a good thing. You can all sit here and say what you'd do or what is right but until you yourself is thrust into that position you have no idea how you would react.

Also if you shoot them and they live what would stop them from exacting some revenge on you in the future?

On a side note that chick was pretty hot.