I don't think it is wrong. It is a maladaptive coping skill that works. For me the reason to stop is that it physically endangers my body--even a small cut can become infected--and it emotionally endangers me. That doesn't make it wrong. If it did eating a donut would be wrong because a donut does the same thing. Eating a donut endangers your body by messing with your blood sugar and making excess weight gain a greater risk. It endagers your emotional self because the sugar and fat change the chemicals in your brain causing some people emotional upset.

Don't get me wrong, I am not saying self injury is no worse then eating a donut. I am just saying that there are many things we do each day that affect our mental well being that have as much affect on our brains but aren't thought of as wrong or bad. To put self injury in the realm of right and wrong sigmatizes it thus leads us to more shame which of course increases our need to use a coping mechnism that just isn't in our best interest.
Carrie