On or around Tue, 20 Nov 2007 22:17:25 -0000, "GbH" enlightened us thusly:
Personally, I don't he should resign. It's vanishingly unlikely that he, himself, made the decision that led to one person (who was, from at least some accounts, acting suspiciously) getting shot.
It's very sad for the family and so on. But consider what would be the response if the bloke HAD been a bomber and instead of shooting him they'd let him run off and blow up a tube train...
Damned if you do, damned if you don't.
Also, if you insist on the top bloke in the police (or whatever) resigning whenever there's a cockup that leads to (in this case) ONE unnecessary death, then you degrade the effectiveness of the force as a whole, as it'll lead inevitably to them not doing anything for fear of the consequences.
IMHO, of course...