You can't dig someone else of a bad situation. I mean, can you? When people are down in the dumps, you can try to help them out and drag them out but usually they'll come up whenever they're ready to come out. I subscribe heavily to the idea that a person knows how to self medicate. If they need some drugs and rock and roll, they'll go find it. If they need friends or television, they'll find it. But what happens when you see that the path they're headed toward is a terrible one?
People love to use the phrase, "we're all adults now." I disagree. We're totally not adults now. We're basically still children. In fact, the more I learn about adults (anyone five years older than me, I still have a high schooler's mentality of what constitutes "older") the more I'm skeptical that anyone evolves past the child stage.
If you're a shitty seventeen year old, and then a slightly better but still shitty twenty four year old, there's a good chance you'll just be an almost not as shitty forty year old.
What changes, I think, is the amount of people who can or want to feel responsible for you as you get older. If you're a real drag to be around when you're old, you'll just find yourself in pothole after pothole, with less people to lean on as the years pass.
This is a working theory.