When is murder justified by self-defense?

[Zkuq]

hudsoniscool said:

If me or my kids are in danger, I would do whatever it takes. If someone breaks into my house they are done. Honestly whether that person intends to harm us is irrelevant to me. Said person doesn't deserve the air they are breathing.

For your own good, I hope no one ever breaks into hour house. If you killed a regular burglar, I doubt you'd have an easy time justifying that. And I believe in most countries you wouldn't even be able to get away with it at all.