You have no idea why Trayvon Martin was killed and neither do I, so that really isn't a fact. Also, not defending Bennet, but from what I read you only saw a portion of the footage...though I don't care about him anyway.
As far as what percentage of whites and blacks are killed by police, just because whites are killed at a higher rate does not mean that blacks are not prejudiced, treated differently in certain circumstances, or even shot because of the color of their skin. The two are mutually exclusive. And I'm not saying it's widespread, I'm saying I don't know. There are shit cops everywhere you go, but I hope that they are in the minority. Does one racist cop who says don't worry, we only shoot blacks prove their point? No. Do your examples prove your point? No.
Sure we do. He punched George Zimmerman in the face and knocked him down and then he jumped on GZ and pounded him. GZ pulled out his gun and shot him.
That's how the court saw it.