You know nothing about cutters. I'm a straight A student, captain of the soccer team and ex captain of the dance team ( I quit so I could focus on soccer.) I've been cutting myself for almost a year now. Mainly because I was sick of people judging me, people like you. Whenever I showed emotion people would laugh and tease me, when I cut, no one knows anything is wrong and I get those same feelings out. Maybe learn something about cutters before you start judging them.
People who cut are hurting deeply. They can't show emotion properly (for various reasons); so, they cut themselves instead. Cutting isn't a joke & cutters are not stupid. They feel depressed & stressed. Cutters need support & people [friends & family] who will love them through their pain & they need Jesus's love to heal them. Don't be cruel. Love more; hate less.