No, we don't need a flash mob to potentially get in the way, cause a scene or otherwise interfere with police business. But we do need more people recording and holding them accountable. If you happen to be there, by all means record it. But don't go actively seeking them out especially in large groups or otherwise provide them with a valid reason to enact an all out ban on the practice.
The police do have an important job to do and the majority of them are good people. But since there are those bad actors out there and we don't know who is who, we still need to have this ability to watch over them.