Slashing your wrist is what you do when your depressed, no? And you should be depressed because you don't belong, right?
I know the above sounds daft, but reading literature on depression, an impressionable teenager could soon get the impression that a *genuinely* depressed person would could cut their arm. So cutting your wrists becomes a test of dedication; a reinterpretation of the classic cry for help.
Being a teenager can be hard time because, simply, teenagers have no sense of perspective. Not having had a girlfriend by a certain age can cripple some people-perhaps make them question their own sexuality for example (I dunno, could explain all the tight black jeans). Or having a one month old relationship break up can seem like the end of the world. A teenager can soon start feeling depressed and like they don't belong. Teenagers feel for the first time a desire for a different type of human companionship-it's a powerful feeling which can be hard for some to handle.
And I guess that is where Emo kind come in. Teengers simply have to be part of a social group; they just don't function otherwise. It's why music is popular with teenagers. Emo just mops up all those people who don't feel they belong to any other group; emo kind seems to accept anyone. Its a rebranding of yet another group that is into alternative rock and its depressed ridden lyrics.
So yes, emos will eventually get over themselves and being emo is perhaps no dfferent to being a chav, but you can't hate a teenager for wanting to express their emotions or belonging to a social group. It's what teenager do and unfortunately, as infuriating as it sounds, a lot of teenage depression really is just a phase, and so genuine depression can go over looked. but you can't blame the emos!