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Nyloncapes I'd always want them to face questioning and trial so you learn more about their motives, how they were radicalised to help address how we stop others going the same way. Additionally I'd want him to spend the rest of his life in gaol considering what he did.
However having watched the footage and given the vest the officer had no choice and obviously had to shoot to kill to reduce the risk. That's sadly why they wear the dummy vests they want to be martyrs it's a shame he wasn't denied that.