Well, if the Costco 911 call did say there was a crazed, gun-waving, berserk customer running wild, as people have claimed, then one would assume that the police would release it because it supports their side of the story. Could it be that the 911 call wasn't all that crazy to begin with and that the overreaction was all on the part of the cops themselves?
the 911 tapes are apparently under seal by law until the coroner’s report is issued, so your assumption would be wrong.