Is it ever justified?
If not, why?
If you think it is justified, when is it justified? This is the point most people start to disagree-when can you use deadly force...
Do you have a right to be responsible for your own safety or do you think an individual gives up that right in "society" and entrusts that right to the LEOs? In other words, do you think you have to wait for the police?
If someone breaks down your front door & comes into your house with a weapon in hand (gun, knife, bat, ...) and grabs your child and starts to drag your child out of the house, is deadly force justified? Does the weapon, or lack thereof, matter?
Does your answer change if the intruder/kidnapper starts to take your child into a car to drive away?
Or, would you rather die than take another life?
Let me say, there is the rule of law (that varies by jurisdiction) and there are moral & ethical opinions. There is also emotional positions... The answer depends on you and may be "right" for you and "wrong" for everyone else.
Would you feel okay with shooting someone who had just destroyed your front door and was entering your house? Would they need to do ... more? What else might be required? How close do they have to get? Do you know how much distance a person can cover in 3 seconds? Do they have to appear threatening? Would a 140 pound woman or man meet this definition? Or, is it they had just broken into your house enough?
Do you have to wait for the police? When is it acceptable to act on your own? What if the response time to your door was 30 minutes? Do you feel as safe as someone whose door the police can get to in 3 minutes? Does the time matter?
Don't just rely on your initial emotion or thought... Use your slow-thinking (that logical thought process). Question your thoughts, test your position.
What say you?