Very true, I picked this example as a thing that kids could theoretically be doing right now. You don't have to go very far back at all to get into the really heinous stuff. There's a big complicating factor in what parents would have actually prevented as a bad influence too, children cheering on at lynchings were accompanied by everyone else in the town cheering at lynchings. If there was a disconnect between parents tolerance of lynchings and child exposure to lynchings it didn't last very long.