Police once again demanding you don't film them, and want your ID

I wrote recently about police demanding I.D. from citizens without a reasonable suspicion of a crime. Well, this is one more example of what I am talking about. In this case, after a horrible shooting at the state capitol building in Austin, Texas, a Texas state trooper demands a citizen's I.D.

The citizen was filming, from a pretty good distance by the way, just as local television was also doing. Of course, the trooper didn't bug the local station for I.D. Joe citizen, is something completely different. The cop tries blocking the camera from filming him by putting his hat in front of the camera. Police are public officials and they can't keep themselves hidden, especially when in uniform. Thankfully at the end an officer who knows the Constitution allows the filmer to leave.

 The second video is a collection of scenes of cops demanding citizens not film them, when police engage in an encounter. They film us, but we can't film them? Just what are they trying to hide?