If you sell refurbished dishwashers but claim they're brand new, or if you charge six hundred quid for plumbing jobs which should cost more like eighty, the BBC will send round a crack squad of investigative journalists and industry experts to entrap you into conning someone in front of a phalanx of hidden cameras. They will then broadcast your name and the name and address of your company and any other company you may have ever been associated with, and they will publicly accuse you of a crime or at the very least immorality.
If, on the other hand, all you're doing is raping kids for forty years, apparently the massed ranks of the BBC's award-winning broadcasters will shrug regretfully and say, "It'd be our word against his. How could we possibly prove it?"