That selective showing of the Rodney King tape has to be the worst journalistic malpractice I can think of that I recall, and the people’s deaths in the riot that followed can be laid at the feet of the “media”.
I checked the SF newspaper and there isn't any major front-page coverage of the story (at least in the online edition). The reaction here seems almost subdued. The first thing that someone jumping to conclusions would do would be to compare the Zimmerman/Martin case with the Mehserle/Grant case (BART cop shot someone behaving in an unruly manner Jan. 1, 2009, ruling was involuntary manslaughter, see story here: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/06/13/BAIJ1JT7CV.DTL). You would think the SF Chronicle would be working this angle heavily, but no. Reasons? One would be that the Zimmerman/Martin case is too geographically far away to have any immediate impact here. Another (and many local readers of the Z/M story have pointed this out): there are so many homicides in the SF East Bay (Oakland mostly, also in Berkeley, Richmond, and San Leandro) that are black-on-black and happen so often, with no "official" reaction: no community outrage, no cries for "social justice," no petitions, no marches, etc. that people have become jaded and cynical.
The (almost) non-coverage of the Zimmerman/Martin story here in the SF Bay Area is almost a story in itself (at least to me).