Not blaming the victim
Allow me to disagree with Perry de Havilland where he says:
Anyone running from armed cops who have challenged them first in London today should expect to get shot dead given the clear and present danger we are in
Well, uhm, no. This is crap. If we don't execute murderers and rapists why then should we have a death penalty for "failure to obey police instructions"?
What is needed is a bit of common sense, or, failing that, well defined protocols: either you arrest a suspect, or you put a tail on him, but once you put a tail on him, you don't put a few in his head if he wants to use public transport.