Maybe I didn't express myself very well: I didn't mean that the police shouldn't be held collectively responsible but that this video could give them (the IPCC etc) an opportunity to blame the one officer (given his apparent renegade actions) and absolve the others.
I think that the context provided by the various videos taken around Royal Exchange Buildings, both at the Threadneedle Street and Cornhill ends, is enough that reasonable people might infer that the unidentified officer suspended for the assault on Ian Tomlinson was not 'renegade', and was not acting autonomously, but under direction from other, more senior, officers on the ground.
The suspended TSG officer more than once confers with other officers before and/or after a contact incident (eg the baton strike on Ian Tomlinson); those other officers, by their dress and/or behaviour appear to have some kind of operational authority, given how still more officers seem also to look to, speak to or otherwise act in a manner which suggests deference those 'operationally authoritative officers'.
Note that the suspended TSG officer - who wears no shoulder numbers, nor carries a shield - never appears to be directly facing a threat throughout the 'dog attack' and 'American tourist' incidents, does not act in concert with other TSG officers as one might expect but instead on his/her own, and positions him/herself in the centre of the police massing at these incidents until moving forward to swiftly make contact (or be capable of so doing) and then equally swiftly pulling back. That is to say that despite being - as a TSG officer - of notionally peak physical condition, and a public order specialist highly trained in 'riot control', this officer leaves the frontline of the cordon to lesser-trained officers in less protective kit.
The evidence hence implies that the idea of 'one bad apple' simply does not make sense.
(1) The deliberate and considered manner of the actions of this officer;
(2) The presence of apparently senior (in terms of operational deployment if not rank) officers;
(3) The aggressive behaviour of other officers (eg the dog handlers, the City of London officer in fire retardant boilersuit);
(4) The immediate or nearby presence of public order specialists (as well as the solo TSG officer, there were the Level 2s with shields, the suspected FIT officers, City of London CS Alex Robertson - Bronze Commander for the G20 policing operation, etc);
(5) The equipment and dress of the TSG officer when considered with that of those around him (no shield, no ID, no fellow officers from the same unit);
And so on.
Each of these points might individually be discounted, but together they form part of a compelling circumstantial case, that the suspended officer was acting in a manner consistent with practice, standing orders or ad hoc deployment by other, controlling minds.