I mean, why not? I've stopped self-harming myself about six months ago, the reason was that it stopped giving me any pleasure and relief. But I did a lot.
Why won't you consider this as one of possible coping skills? It does helped me, so why won't I use it? Ok, if the argument is that it hurts the ones who loves you, and they see these cuts on your body and worry about you:
1. Why don't they worry much more about the PAIN I experience, which makes me cut myself?
2.
3. Why can't I just cut myself on body parts which are invisible for others?