Very difficult to prove any of the things you said. Did you have a surveillance camera? Did you advise the officer(s) that you wanted to press charges? Were the suspects juveniles? Lots of questions of which answers could “shed” light on why HPD left without incident. It’s worth noting that they are law enforcement officers. If Keith Kaneshiro is too lazy or inept to prosecute — or the evidence simply isn’t there — they aren’t going to waste their time making a case.