I don't see a contradiction here. It was a senseless killing. If you accept Zimmerman's story at face value, then Trayvon attacked senselessly and was killed for it. Cain isn't saying it was cold blooded, that Zimmerman was wrong, or that the police were racist.
Where is the investigation? . . . troubling questions about how police initially handled Martins death . . . It appears there wasnt an immediate or thorough investigation.
I don't necessarily have a problem with this either. The country would be much better off if the police had documented a complete and thorough investigation so that they could tell the morons on the left where to go. Given the information that is being made public by the biased media, it is not clear whether the police did their job correctly. It may be that the lawyers are stifling the public affairs officers as they decide what they can say about a juvenile delinquent who was killed in self-defense, but the police are not covering themselves with glory by presenting the results of a complete and professional investigation.
And Hiroshima was a senseless bombing.