In need of Love.
As someone who works in two seperate treatment centers I have had the amazing opportunity to work with some great kids. Some are a handful and annoying beyond belief. And there is one common denominator I can find among all the kids. They all just want somebody to love them. Thanks to their upbringings though they don't know how to get love. Parents these days are the bigger problem, they don't parent their kids. They are either trying to be the best friend while their kids get drunk, do drugs, or steal. Or they are so abusive that kids go in to survival mode just to make it through the next day. It's not the kids fault its parents who dont know the line between friendship and parenting, or abuse and a punishment.
I'm sorry I know this is kind of all over the place. But when you work where I do you learn that almost everything a troubled kid does is a cry for help. And most of the time those cries for help stem from something a parent isn't doing for that kid.
Now don't get me wrong, I've seen some amazing parents who have done all they can for their kids but nothing works. And those kids are generally the adopted ones. A lot of times they don't believe that anyone can love them because their birth parents gave them up. Whether that was for better or worse is besides the point. The kid doesn't know that, they just know they were given up.
In the end it's not the kids. Its situations that create mental trauma and issues in a world where almost nobody cares to help them.