it's much more complicated than just why or why not, a lot of things are weird and it depends on the person to know what drives them. a lot of time it's depression, it's a way of rebelling and fitting into a social scene, also some say it feels good to be bleeding profusely, kind of a lightheaded feeling that's a certain type of rush to some. also maybe a slight adrenaline surge, the feeling of holding your life in your hands, if you don't cover up your cut you could die. but mainly i think it's just something that's fit in socially, kind of like a way less used and extreme version of drugs, it's a nasty concept but some people find good things from it and get hooked and then fall into social pressure. it's so strange to me and i think the only way to really know what motivates someone to do that is to hear first hand. so yes, it is a stupid question in the sense that you won't get a clear answer unless you confront a cutter but it's a valid point and fucking weird that people do that. so there's my long winded answer/rant of the week