Good thing some of my punk/emo friends don't do that. I think it's absolutely terrible. I cannot at kids being "relieved from stress" by doing that. I would be screaming in pain if I did that to myself.
I've had a couple of classmates who cut themselves when I was in a partial program a couple years back. I never asked them about it because I figured we all had "abnormal" issues since we were in that partial program.
I would never cut myself. I even hate it when I'm unintentionally cut by something. Besides that, I don't want any ugly scars on my wrists. Nope.