What the police did t Waco is, when the criminal does it, is called witness elimination. Granted they did not kill them, but they neutralized them just as effectively as if they did. They destroyed, or until it is proven different, it is safe to assume that they did, the video evidence they had on their cell phones. The mere fact that they were arrested has tainted their credibility as far as the general pubic is concerned.
The police have finally got their stories straight. They have made their videos to accompany their stories. Most importantly, they have found that the public at large, including Waco does not give a damn. In fact, since these are such a hated group, the public applauds them and cheers them on.