Well, I think SilentDeaths' point still remains. Even while tailing, there were opportunities to arrest, if that was part of the policy.
I still think we should stay off the personal side of what it's like for the policemen involved. Most people obviously imagine it must be terrible, but I'd be lying and sentimental if I said I knew what it felt like.
It won't logically stop criticism either - for all you know the policy of tailing but not arresting may equally have caused the grief and stress for everyone concerned. In that case no-one making decisions last week would have been responsible, but instead the people who decide policy, who, being multitude, never have to take individual responsibility.
btw iranu, your friend may do a specific aspect of neuroscience research now, but psychology degrees teach you a lot of unproven theories. A neuroscience/ neuropharmacology degree teaches you to be be more cautious. Didn't you wonder about the evidence for the 'heroic' theory? It appeals quite neatly to intuition, which, as Steven Pinker* said, is often wrong.
*computational neuroscientist (and, yes, psychologist). Also very funny.