I understand the study and (not surprising) results, but 200 years ago children were not watching violence? Like public executions? Violence alone is not a pro

I understand the study and (not surprising) results, but 200 years ago children were not watching violence? Like public executions? Violence alone is not a problem, violence without explanation of who and why is the problem. Our civilization is built on violence. Forcing you to pay taxes or we will take it from your account ourselves is exactly the violence. You did not payed mortgage? Sad we will take the house and leave you in the street. You pushed police man? You probably be forcefully apprehended, cuffed and thrown to jail. Violence. Violence is not a problem, violence without explanation is the problem.