Nonsense. The whole thing is about a white (hispanic) man killing a black one. Justification or not is peripheral at best to the coverage. It is all about an opportunity for blacks (who apparently go around desperately searching for things to be offended by) to vent their phony synthetic outrage at the killing of an (alleged) thug.
Once Sharpton and his group get involved, it does become a media circus with racism taking center stage under the big tent. HOWEVER - none of that makes the question of justification irrelevant.
There are a whole lotta "ifs" circling this situation and calling for an investigation is not unreasonable. On the other hand, calling for the lynching of Zimmerman is and that is unfortunately the way things have turned. That doesn't nullify the need for an investigation though.
White, black, Hispanic, whatever - this still comes down to a question of whose actions are justified under the Florida's Stand Your Ground law.
Was Zimmerman justified in calling the police to report a "suspicious person?" Yes.
Would he be justified in keeping said suspicious person in sight? Yes.
Would he be justified in approaching said person? That seems to depend on how he approached that person AND how that approach was perceived - "hey man, you live around here...can I help you find an address?" or "hey asshole, stop right there! You aren't gonna get away with anything time!" The former approach is perfectly reasonable; the latter could give Martin justification for "standing his ground" under the law. IF Zimmerman also went as far as approaching Martin in a "threatening" manner i.e. flashing his gun/holster, etc., then Martin was also justified under the law to defend himself. Zimmerman had zero authority to demand any type of compliance from Martin.
If Zimmerman did not approach Martin (or even if he approached him in a non-threatening manner) and Martin jumped him, the shooting, while tragic, would be justifiable under the law.
That old saying about there being three or more sides to the truth seems to apply perfectly here. An investigation is the best way to reconcile all the sides.