WHOA BACK OFF!!!!!!! People hurt themselves because there trying to deal with pain.It could be physical or emotional pain.People don't hurt themselves for no reason,there's always a reason.So don't be quick to judge.I agree with @iAshlynn.
Its not for no reason. , They are emonlishly hurting on the inside. and by cutting it is a temporary relief from the pain.. as straing as that might sound.. its like the pain of cutting hurts more than the pain inside.. to make you foget the ''real pain'' in ones life like being sexly abused or fat ect. what ever it may be..