And the London Police have not backed down from the policy. In the same situation, the will shoot the perp in the head. Which is exactly what they have to do.
Tragic in the case of the poor Brizilian guy who was killed? Yes.
But that man was a casuality of war - killed by al-Qa'ida and their tactics as surely as if he had been blown up by one of their bombs.
Much discussion on the topic here.
The truth...? You can't handle the truth..