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When abusive parents hurt you, they're not 'doing it for your own good' or 'disciplining you', they're singling you out and making you a target. Because they're not doing it to all other kids, they're not doing it to their guests, friends, coworkers, bosses, neighbours, it doesn't even count if all of those people make one of the same mistakes you do. It's allowed for them. It's okay if anyone else does it. It's okay if other people break things, or refuse to be controlled, or speak up, or demand something, or act selfish, or act childish, or don't cater endlessly, or don't guess their moods, or don't act submissive, it's okay for everyone else! Just not for you!
What exactly is that teaching you?
That you're different. That the brutal and torturous rules exist only for you. That you are the only one who deserves no allowances, no forgiveness, no gentleness, no tolerance, no nuance, no love. And you are the only one! Everyone else can get those things and do what they want, but you will get tortured for it, you'll get tortured even for things you didn't do, because these two people have singled you out and deserved that you're so rotten you deserve worse treatment than any other person alive. And those people are your parents, they made you.
It teaches you injustice, it teaches you to put yourself in a different category than anyone else in the world and to assume you must be so intrinsically different that you won't ever find community, you won't ever find somebody to be on your side or similar to you, because you are the only one who could ever deserve this kind of hatred. It separates you from humanity and makes you feel like you don't belong, like you don't have a home here, it makes you abandoned by everyone because nobody is stating anything different about you. With their silence, dismissal and neglect, everyone is passively agreeing that this is what you deserve. That it doesn't matter to them if you live in pain and despair because you're too different, too otherworldly for them to care about.
No child has deserved to feel like that. Nobody is supposed to be pushed into that pit of despair, injustice and pain, alone, with no visible way out. With nothing they can do to redeem themselves, to find a way to see themselves as human after all that's been done to them. This is not a pit that somebody can easily crawl out of, this is something that can follow you all your life.
All children deserve better than this. Never defend abusive parents when they do this to a child. If you don't want a child to believe themselves to be a monster, don't ignore when this is happening and don't act like it's none of anybody's business. It's all of our business to make sure no kid thinks this lowly of themselves, not even if their parents decide they should. Parents who do this to children should be charged with torture, isolation and psychological devastation of a human being. All children are human. And no child deserves that.