It seems some people here are displeased because there are so many "rats" and so many mobsters are being put in prison with their testimony. That doesn't make any sense to me.
If there is no loyalty among criminals, it's a good thing for honest people.
Of course, the fact that informants often get away with their crimes only because they agree to cooperate is a bad thing, I agree with it. But what's the point of hating "rats" NOT because they are CRIMINALS, but because they are INFORMANTS? It's as if you felt pity towards those whom they help to put in jail.