I suspect that is a big part of the reason then why you don't see that the picture on the survivors of suicide post is such a big deal for some of us. when we ask for help, such as not being intentionally exposed to images that are of a girl who has obviously cut herself, and are told that we have to suck it up and deal with it, it is quite upsetting.
we don't want to cut. we don't want to hurt ourselves. but sometimes the only other option is one that is a lot scarier than re-directing the intense emotions we are feeling by cutting.
Are you someone who lives with PTSD or cPTSD? I can't remember...
For myself, when I stopped self medicating with drugs and alcohol, the horror of what I was remembering and the images I was seeing inside my head for the first time without having the numbing effect of the drugs was too much. Part of the automatic reaction my body had was to dissociate. Another reaction my brain and body had was to go into an absolute state of panic, the likes of which I would never wish on anyone. To literally feel like I am dying, and then realizing that I am not but wanting to so that the pain and the memories and the horrible images inside my head would go away...sometimes cutting is the only thing that could stop it. The pain gave me something to focus on. Often it would stop me from completely dissociating.
Another big factor for me in cutting is to punish myself. It is a common response in people, especially women, who have cPTSD, who were raped, and who grew up in abusive homes. I know that other people I have talked about this with share a lot of the same feelings about themselves that I do, such as feeling dirty, bad, not worthy of anything good. Feeling deep down inside that everything bad that has ever happened in my life is completely my fault. That the things that happened to my family are my fault. So I deserve to have the ugly marks and scars on my body. If something happens now, like someone makes plans with me, and then doesn't even bother to call me, they just don't show up, then that is my fault too.
I wish that self injury was something that could be neatly and tidily put into a pigeon hole, but it is honestly one of the messiest aspects of living with cPTSD. And there are as many ways to self injure as there are people who do it. Some people use food, or drugs, or alcohol. Those are deemed to be more socially acceptable. Another one is over exercise, anorexia, bulimia. Better to be thin, right? Wrong. It is all about control in that respect. Some people self injure as a way of taking back control in thier lives. They are ourwardly showing the world that no one else can hurt them...they are taking back control of their bodies.
Some of us do it as a type of warning as well. For a time, I didn't bother to hide my arms, despite being covered with cuts and stitches. It was kind oflike I was wearing a giant, flashing 'warning' sign on my forehead. I didn't know what way was up or down, if I was coming or going, and I felt so scared of myself, that I didn't want to subject anyone to myself the way I was feeling. If that makes sense.
It was also a way to let people know how hurt I was. Because of the majority of my trauma happening when I was quite young, I apparently don't have the best verbal skills to be able to talk about how I am feeling. I was not allowed to have emotions when I was growing up. I had to be the perfect kid to protect my mum and I, so that he wouldn't hit her, and he wouldn't scare me and yell at me. So I don't know how to express emotions that well.
Anyways, I could ramble on and on and on for hours about self injury. I find it to be quite fascinating, that mammals have this bizarre built in capability which over rides the other built in drive for survival, which will allow them to harm themselves as a means of controlling extreme stress. Short answer I guess is that self injury is a coping mechanism because the alternative is death. Self injury is completely different than attempting suicide. Self injury has this frantic type of energy to it, which I think is the absolute desperation to make it through the situation. For me, when I tried to kill myself a couple of times, there was no sense of urgency to it. It was a sense of absolute resignation.
Hope that helps a bit.