In the case of Zimmerman/Martin, I'd like to think that it got public attention because the family wouldn't let the story die or because there was such overwhelming evidence that someone (not an angel by any means) may have died an unjust death and the police looked the other way instead of doing their job.
With the video in the OP, it's obvious. The black people were dead wrong. Nobody can defend what happened in that one. And the comment about how this didn't receive any media attention--it's pretty open and closed and I hope that the offenders are captured and severely punished. At the same time, you have to think about all of the murdered/kidnapped black children/women that never receive any media attention. Meanwhile Laci Peterson, Chandra Levy, or Casey Anderson are virtually household names. The media is definitely not a fair and balanced entity. Not at all.
http://en.wikipedia.org/wiki/Missing_white_woman_syndrome
