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It did seem odd to me that he had the camera rolling before he "saw" the roadblock.
Of course it was planned. The driver thought that police had a tendency to respond in illegal fashion to perfectly legitimate behavior, and he wanted to document and expose such tendency. Taxpayers have a right to know what their servants are up to.
The behavior of bad officers contributes to a generalized distrust of police which in turn makes it harder for good officers to do their jobs. I wish there were more good officers willing to stand up to them.