If a website has an absurd bias, there's no reason to use it as any kind of credible source. Crooksandliars.com? I watched the first few seconds of that video, and it showed police mid-arrest of someone who was clearly resisting. Then it had someone with an obvious bias interrupting the actual video. I have a hard time seeing that as proof of anything.
The other two were about the same incident, which looks pretty bad. Of course, the second of the two Observer links was discussing the DA investigation. So... yeah.