"This is clearly a fast-time decision-making process, in which officers cannot risk the kind of containment and negotiation tactics which would normally be the case."
In other words, you kill one possibly innocent person to prevent the possibility that a larger number of innocent people will die.
What Sir Ian Blair is unable to grasp is that most important thing is to prevent people falling into the grip of those who organize terrorist actions. Killing an innocent person and then on top of that refusing to have an independent investigation is the best help the terror recruiters could get.
Sir Ian Blair is incapable of seeing the wider picture - that's why he should resign.
Sir Ian Blair