In what sense am I ignorant?
I don't think you're being ignorant, just that you can't seem to grasp (1) the nature of addiction and (2) that you don't choose it. The very nature of addiction throws logic and objectivity out the window. It removes choice.
Gascoigne choose to drink, yes, but he didn't choose addiction. Everything you're logically seeing and expecting from him is everything addiction takes away from a person. His only driving force is the drug, despite knowing the damage it's doing to him. As in, his compulsion to drink is greater than his compulsion to stop.
If you saw that recent video of him, you'll see a desperate, broken man. If you still want to see him as choosing to be that man, so be it.