My dad drank heavily for a lot of years. I grew up hearing tales of his legendary drinking. Mom would buy him a case of beer on Sunday and if he ran out mid-week, he would drunkenly accuse her of drinking his beer -- which makes no sense because mom is a tea totaller. He would go on a bar crawl on nickel night and hit dozens of bars with his buddies. Etc.
He was in the army and he fought in the front lines of two wars, WWII and Vietnam. He retired when I was three and apparently began tapering off.
I don't recall him having the DTs. I don't recall him drinking heavy in my lifetime. I recall him having a beer as part of dinner when I was four or five.
When I was seven, he was diagnosed with a heart condition. He blamed it on the alcohol and never touched the stuff again (except for a few sips when my brother hit drinking age while talking to him about what made for a good beer, I think).
By then, he had been out of the army for four years or so. He had time to taper off for a few years before making his dramatic announcement that he wasn't drinking again.
I think he drank to suppress his nightmares from serving in two wars. I think he didn't need to actively suppress his nightmares anymore after he dropped his retirement papers and no longer had to live in fear of being sent back.
I think people drink and drug for a reason. We just mostly don't bother to try to figure out what the reason is for this specific person and we just act like "You are a badly behaved child who needs a spanking and you need to just try harder." And then blame them when that stupid idea consistently fails to be an effective solution to their problem.
Edited. Cuz typos and auto-corrupt.