I'm way past the addiction stage, am in the gutter. Glad you had the sense to stop while you could.
I've seen enough to know that beating addiction is tremendously difficult, and without reasons to beat it, coupled with a strong support system, it's no surprise 1/20 deaths are due to alcohol abuse worldwide. Not to mention the other drugs, especially opioids here in the US.
As I said, however—in my case it's not even close to being the main reason for ctb.
I tried to ctb in my early twenties and rarely drank. It's just a temporary coping mechanism to alleviate anxiety and give me some short-term peaceful feelings.
I think you're spot on that there need to be reasons to beat it (coupled with a strong support system). I've always had reasons to resist giving into my eating disorder tendency in the past, but now I don't. When you have no reason to resist it, why would you even try?
For me it is mainly about boredom and lack of pleasure/reward in life, coupled with no incentive to resist it. Perhaps addicts of various stripes can relate to that.
I am perfectly cogent and responsible in other ways, so it's not always that 'how you do one thing is how you do everything'. Like suicide itself, you could say it's a rational choice.
Also, it's not at all my reason for ctb. But it is rather tied up with some of the same issues (profound boredom, lack of reward in life, the body degenerating over time, etc).