Pretty much we see the outside of the whole scenario. We hear on the news that a guy from a organized crime group testifies against other members there. In reality these guys double cross each other in any way they can. And there's a load of examples. No-one wants to sit in prison covering up people who didn't pay you your cut from the deal or fucked your wife behind your back. And the reason is you cannot trust any of them. Simple as that. That's why they snitch each other out as no-one of them is worth wasting your life in prison.