Denial is one of the defining features of addiction, and it is not a personality flaw or simple stubbornness. It is a mechanism that allows someone to continue a behavior they are dependent on without having to confront the full weight of what it is doing to them. The brain under addiction actively works against honest self-assessment. The destruction has to be acknowledged before it can motivate change, and for some people that reckoning never fully arrives, no matter how much evidence accumulates around them.
The hard truth is that some people never change. They will keep repeating the same cycle, and the people who care about them keep paying the cost of that cycle alongside them. Jail and prison do not automatically produce the insight that years of consequences could not. The walls themselves rarely stop someone from drinking once they are out.
What does sometimes break through is a moment of genuine internal reckoning, often after hitting a floor that is low enough to be undeniable. Where that floor is varies by person and cannot be engineered from the outside.
If you are the one watching this happen, the most honest advice is to protect yourself. You cannot want recovery for someone more than they want it for themselves.