I think the ones who don't rat really just hate the idea of ratting so bad that they just can't do it. Like snitching literally turns their stomach upside down. I don't think it really has much to do with a sense of honor. But what do I know.
Like the Geas brothers that even if was only associates prefer to get life and killed Bulger because wss a rat even if was an 80 y old man on a wheelchair.
