Police shoot and kill homeowner who had just shot and killed an intruder.

[sarisataka]

7. I don't believe I advocated that

Nor would I as mistakes can be made. Although from what I have read it is unclear if he was even aware the police had arrived

When police arrive on a scene and encounter a person with a gun in their hand is that sufficient justification to open fire?

Do the officers who fired have any responsibility or is this simply a tragic mistake with the fault at the feet of the homeowner?