Just for the record, let me say this. I was a prosecuting attorney for 12 years before I got appointed to the bench. So Treo, I've got a bit of a clue as to how the criminal justice system works.
One of the biggest problems I had as a prosecutor was non-cooperative witnesses. People who didn't want to get involved. People who would make a statement to the cop, but when it came time to come into court and back it up, they were too busy. One case that comes to mind was a family that absolutely terrorized a neighborhood. When the father and son beat the hell out of a guy...actually took a chunk of skull and brain out of his head with a shovel...no one actually saw what happened. Yep, 20 people saw a fight start, but suddenly there were trucks in the way so they couldn't see how the injury happened. Or they turned and went inside. Or they just didn't show up. So, they walked. And shot a neighbor two months later, then had a three hour standoff with the police.
I developed a bit of a reputation as being a hard-ass, in that if I had a witness no-show, and a good enough case, I'd get a couple of cops, and we'd go get that witness. Talk about pissing people off. But, more often than not, if I could get the witness in the courthouse where the defense attorney could see the witness, I'd suddenly get a plea offer. Depending on how goo dthe casse was, and whether the witness was going to be cooperative or not, I may or may not make the deal. That was especially true in Dometic Violence cases.
Nothing made me madder, and still does, than to hear people complain about the lack of police efforts and prosecutors who don't do their jobs, etc. and then turn around and say that they would never cooperate with the system. No, the system ain't perfect, but it's still the best one out there. You're still innocent until proven guilty. No brain scans to prove guilt around here.
As for the idiot prosecutor down in North Carolina, he was an embarassment. he should be prosecuted, and sued.
So, back to the OP, I'm going to keep talking to cops. You do what you want. But don't come looking to me for sympathy if you happen to come into my courtroom and complain about the system if you aren't willing to at least help a bit.