So far not a single person has given a coherent or cogent reason why the general public, who the vast vast majority never has and never will have a problem of sibling abuse, should take greater precautions against the rarity of sibling abuse than against parental abuse, which occurs at a far far greater frequency than sibling abuse.
If you’re going to recommend not leaving siblings together with siblings unsupervised in their room you surely should recommend not allowing parents in their children’s room without a third party present.