It's not about drawing the line, it's about quantifying the impact.

I think this is what people don't get about the study. The study is not saying no one should drink. It's not saying that the risks of drinking outweigh the benefit. It's saying that for any amount of alcohol, ingesting it, on aggregate, decreases life expectancy. Nothing more. It's a measurement of the increase of risk, which can then be combined and contrasted with other measurements and help make informed decisions.

You draw the line however you want. You now have more information to make that decision.