My ex girlfriend, who I loved very much, used to cut herself all the time. It freaked me out, but I just left her to it. I'd be like "oh, I'm gonna go make a cuppa and have a smoke" and just leave her in the bathroom looking like a twat.
Despite the fact that my ex was crazy, I still don't have a problem with smiley that cut themselves, because let's be hoest, if I try really really hard, I can surely find more important things to worry about.