While the video is now back up, this is a prime example of why net neutrality and avoiding digital silos is so important. Facebook gets to be the arbitrator of what we see, effectively creating a filter bubble, and since its motives don't align with the public's, it's a system rife for censorship and exploitation. The police could likely get the stream taken down for being "part of an ongoing investigation" or they could take the videos down later via DMCA requests or reporting it.

We need to make a conscious effort to move away from these sole repositories of humanity's video content. Youtube is still a dominating player even though we have HTML5 video support in all browsers. As mentioned before social media sites are not ideal for this job because of onerous terms of service and arbitrary removals. "What police brutality? I don't see it." Control the content and you control the narrative. Ideally in the future we'll look back and laugh at the fact that we all entrusted our videos to a private company's servers but considering how storage space keeps going down and the "cloud" keeps getting shoved down our throats, I'm not optimistic.