Must be selective and they've had a ton of time to go through them all.
They only blurred citizens not cops.
Even in the first batch one can see the appearance of stagecraft - before the protestors even arrived, the Capitol Police had already segregated the areas where they were to be led using yellow caution tape. Who gave the order to set things up like that and when did the order come down?
If the face is not blurred then the person is not a private citizen If there are government agents or plants inciting violence they can be identified and their faces un blurred if they are not already done