A child of this age doesn't have much ability to distinguish right from wrong at all, and as can be seen from the surveillance video, he didn't intentionally hit his uncle with a toy at all. As a relative of the child, the uncle should have an inclusive attitude towards the child, but the man's approach is unacceptable. The man's head didn't explode, but he pushed the child to the ground rudely. The child's head directly hits the suggested toy on the ground, which is likely to cause serious injury.
Although there is no direct blood relationship between the uncle and the child, it is really hard for people to accept the child, and parents themselves can't accept it. The child was beaten for no reason. It is normal for children to make mistakes. When children make mistakes, they should teach them patiently like adults, instead of directly retaliating in such a rude way. The man laid hands on him very hard, and the boy still had a deep palm print on his face. His behavior has caused serious harm to the child, and he has no right to hit the child under any circumstances.
It can also be seen from this incident that the man is likely to be violent. If this scene is not recorded by the surveillance video, then the boy's family can't see the man's true face. After his behavior was exposed, the boy's aunt was definitely unwilling to continue living with that man. After all, people who haggle over every ounce with their children or even fight with them must have some moral problems.