why do the primitives want to find Zimmerman guilty?
A couple of reasons. First, according to DUmmies, blacks are the ultimate victim, beyond women, beyond GLBTXSOMB&#s, even beyond Native Americans, and all of DUmmy thinking revolves around a victim/oppressor mindset. So any ill fate that befalls a black at the hands of a person of any other race is by default the responsibility of the non-black person.
Second, it being an election year they hope to galvanize the vote of the black community and the mushy middle by creating a framing that states in effect that, "You gotta re-elect Obama or Teh Ebil White Men and their gunz will have their way and a million Zimmerman's will be out filling the gated community streets with the blood of minorities!!11!1eleventyone!!11
Or something like that.