Left is the word that indicates that someone actively left this baby alone. They could have said baby found alone. Baby discovered. Heck, baby alone for days after mother's death. Baby left absolutely implies it is the doing, or fault, of the person who left the baby. The person who is responsible. Now who will society assume is responsible for a new baby, but the mother?
Even you. You said, hey we could just as easily blame this on society as on the mother! No mention of the absent father.
Lots of people warning you about alcoholism. Idk. I drink coffee strategically every day, and that's a drug. But also yes, I sometimes drink alcohol strategically. If I know I'm going to hang out with my sister who I love but disagree with on many many things, i have a drink or two. I try to dull my brain just enough that I am too slow to get offended at every single thing (or just don't care to, maybe?) in the end, we have a great time, I don't get all debate-ey with her, and instead just appreciate the good things about her. We don't see each other that often so I genuinely don't see any danger from this coping mechanism.