Children’s grievances and showdowns are part of children’s entertainment, these are their games, and they really do not want to deprive themselves of them. When the elder offends the younger, the younger is offended, but if the elder does nothing at all with him, the younger himself begins to pester him.
When my children were small, Sasha often cried that Vanya was hurting him. I was angry with Vanya until I saw with my own eyes how Sasha, while swimming in the river, put his head under his arm, Vanya squeezed it, after which Sasha began to whine plaintively. Not always consciously, children often provoke others to aggression towards themselves: it is more important for them to get at least something than to be left without attention at all.