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People develop drinking problems for two reasons, they have a genetic predisposition to getting more reward from drinking and/or they have untreated trauma that they are medicating. In my family, my grandfathers war trauma was transferred to his kids, who then transferred it to their kids or dealt with the trauma and didn't.

For the genetic side, people often slide into it by culture/habit. For example, it starts with a drink with friends, then a few times a week with friends, then on your own and with friends, after a few years it turns into every night on your own, then a few each night, then you hide how much you are drinking from loved ones, until you (hopefully) realize that you might have a problem. Bill Barr talked about this last year in his standup, for a good example and an example of how you can get ahead of it if you are self-aware. Many people keep going and end up with the physical addiction.

The trauma side is why I think some people have a real hard time shaking the addiction, and tend to go back. The drinking can also cause you more trauma, making it harder.