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How would you feel?
People were stabbed, people died. That alone IMO is enough to warrant shooting to kill. He could never have known the vest was fake but you have to assume for your own life and others that it was real.
Well, if I was in his shoes, at first I'd think I had done the right thing, but then I guess it would depend on how strong mentally i'd be after something like that, but no one can tell you what they feel in a situation unless it actually happens.
I agree with your comment though, a life for a life in my eyes, but in this country, people always get a slap on the wrist and let go again, so I think its a bit of a shock that this has actually happened.