Eh? what on Earth could Moat say that would embarrass the police? The guy was patently a wacko, had attempted to kill his ex, had killed her new boyfriend then decided the police were the issue and tried to kill one of them. He then ran about the Northumberland countryside for a week and held the police off for a few hours by the tactically astute act of threatening to blow his own head off with a shotgun. There's no chance in hell of Moat being a credible witness on anything, should have actually have survived.
I've heard some conspiracy theories in my time... if the police wanted Moat dead, they could just have shot him and hardly anyone would have blinked an eyelid.
Jon