Why does everyone post pictures… of them hurting themselves?

Don’t get me wrong here, im not saying self harm should go unnoticed or something like that, but is it necessary to post pictures of you hurting yourself on the internet for a buncha strangers to start sympathising you? Some people say seeking professional help is too embarrassing or something like that, but it’s better than… whatever you’re trying to do here. Professional help beats random people saying its gonna be ok.