How can we prevent murderous schoolyard violence in children who have access to weapons,poor parental supervision, and a mean streak?"

如何防止校园暴力,这些暴力事件通常是由掌握武器，缺乏父母监管，或受到教唆的孩子引起的“

哈佛公开课 - 幸福课课程节选

So this is why you sometimes had Jews getting in trouble with local groups and had violence with Jews in different places.

所以犹太人常常与当地人发生冲突,在各地都发生涉及犹太人的暴力事件。

耶鲁公开课 - 新约课程节选