Unfortunately this is a tragedy for the individual concerned and his friends and family and an absolute disaster for the Police and those individuals concerned.
I really can understand the points of view being touted by both sides in this argument, the Police officers involved clearly thought they had a suspect who was both dressed as to arouse suspicion, had just left a house that was under surveillance and who did not stop when challenged and then fled TOWARDS a Tube train. It does not take a rocket scientist or a conspiracy theorist to see what the Police offices involved must have thought!
On the other hand, this guy was a Brazilian who had spent time in some of the dodgy slum areas of Sau Paulo where kidnap and murder are rife. Once again it does not take a huge leap of faith to understand what he must have thought when confronted by shouting and gesticulating men in normal clothes who were waving a hand gun at him and yelling at him in a foreign language, you can also understand why he would have fled in a blind panic.
There is no way however to understand what ever made him flee toward a tube train, and then board it?
There are NO winners here, absolutely none.