I come from a background of alcoholics and I'm sure I was heading that way myself at one point. I would say anyone who says they drink to relax has an unhealthy idea about alcohol.
To me the quantity doesn't matter, it's the mindset around the drinking.
An ex used to have a beer a night "to relax", and it made subtle but uncomfortable changes to his behaviour.
In the end I took an "if you can't beat them, join them" approach which was also stupidly unhealthy but I genuinely thought I was the problem and how bad could it be.
My mum will drink a large amount any night she isn't working the next day and whenever she talks about work she will say how hard and stressful it's been, and use being stressed as a justification for buying whatever booze she's fancying that day, and is a massive grouch if she doesn't get it.
I think alcohol can be great at celebrations, or even ceremonies and festivals whether it's a big wedding, christmas, a toast at someone's birthday, a summer bbq, but I don't think it's good for it to be part of someone's weekly or daily shop to be quite honest.