That is one of the most patently ludicrous things I have ever read. 1) You can't possibly be serious, and 2) You obviously don't have children.
What kind of irresponsible lunatic lets a 15 yr-old dictate what he's going to do?!? I have an 18 yr-old son, and it is still my job to ensure his safety. If he wants to stay out all night and drive home with a syringe full of heroin hanging out of his arm, according to your logic I have "no choice but to accept that". No. I can be his actual parent, and do my fucking job. If it means playing cop, then I become a cop-- because I will protect my child--from himself, if necessary-- with my last breath. That's what a parent does.
As far as being "fully functional," the male brain isn't fully developed until around age 25... until then, they have real difficulty postulating outcomes and controlling impulses. This is why teenage boys pay the highest rates for car insurance. This is why teenage boys are the cause of more frequent and more serious accidents.
https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=1&ContentID=3051
What this "mother" allowed sets new standards for reprehensible and unforgivable parenting. If that country has any form of child protective services, she will be investigated, possibly arrested, and hopefully have any remaining children removed from her care.
You're right, she's not an "irresponsible" or "bad" mother, she's far worse than that. She's an abysmal failure as a mother, as a guardian, and as a human being.