As I understand it. Anybody is allowed to use reasonable force to protect themselves but generally speaking, killing or permanently disabling people isn't considered to be reasonable. If you are deemed capable of using reason then the whole debate about what is 'reasonable' kicks in and is considered in hindsight (the calm after the storm) often with unfavorable results for the respondent who is pleading self defense.
Of course it is an entirely different matter if you are genuinely in fear of your life as you are unlikely to be able to use reason when in fight or flight mode. But that argument doesn't work when you chase the person (whom your are in fear of) down the street then kill them with an air riffle or knife.
Political correctness: a doctrine which holds forth the proposition that it is entirely possible to pick up a turd from the clean end.
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