The Balance is hard to strike. It served a lot of peoples purposes to whip the population up into a fear-powered frenzy, especially after the bombings in London.
But for every bit of privacy we surrender, there is a far larger price to pay than simple first appearances. Personally, I don't think this is about surrendering privacy though, it's about making sure your intelligence is correct and that the habit of shooting people because you think they are terrorists and about to do something dangerous is both neccesary when viewed from the Police point of view, but extremely dangerous when the correct intelligence is obviously lacking.
If I were a cop with a Gun, and I really believed that the guy in front of me had access to chemical weapons or the like, I'd be forced to make a difficult decision as well.
BUT.. If we are going to send armed men with orders of 'If in doubt, shoot', then you better make damn sure your intelligence is based on more than stereotype and assumption. The Police obviously believed they were right. Circumstances have obviously proved them wrong.
I, for one, never want to have to go through another day like last years bombings, but if that meant giving the Police carte blanche to make mistakes such as this without any recourse, then I think it would be more than I am prepared to pay.
I'll wait and see what comes of this before I come to a decision.