The issue here is you, not your son.
Nobody is disputing that you had no "right" to the access. What I hear others saying, is that you have the right and the responsibility to protect yourself. And you lose control with access to your son's accounts. They trigger your addiction. They trigger you to give up your sense of control over yourself and your actions. They trigger your illness.
You lose yourself, rebelson. Your best self.
You are responsible, first, to yourself. There is the possibility of a decision here, to either thrive and get stronger *yourself, or to continue to debase yourself in your own mind. That is the decision you can make about yourself. Not your son. You are the issue. Your welfare.