This.
Take this with the proverbial grain of salt, but from what I’ve heard about his time in prison (which isn’t a lot, and is second hand), he wasn’t exactly cowering away and remorseful. He remained as arrogant as ever, and thoroughly enjoyed his celebrity and criminal infamy. He also spent most of his time high, and willingly involved himself with even more criminal prison activity (rather than it being solely the case that he was forced or coerced into it).
He was, simply put, no less a dickhead inside prison than he was outside of it. Being a dickhead to his fellow inmates in Wakefield specifically did mean that his chances of getting his throat cut were significantly higher, however. It’s highly likely that he was stabbed because he wasn’t paying his accumulated debts and/or crossed someone he shouldn’t have.