I'm not saying his kids aren't good, but say in a dojo setting and your kid got whipped by the master during lesson, and he did so to teach the kid properly the ways of the art, are you going to attack him too? Maybe its just my opinion that I think its a teacher's job to do more then pass on knowledge, and while its the parents primary job to cultivate their kids ethics, morale and culture, teachers have an important role in your kids upbringing as well. Its also interesting when I see parents throwing a shitfit when their parents spank the grandchild. Or some other family member for that matter. When my dad was young he used to roll like a thug back in the old country, getting into fights with other gangs and running into the law etc. My uncle(r.i.p.), his older brother would beat my dad's ass like "how dare you disgrace your family." When I got the worst beating from my dad as a 9yr old for failing in school and the teacher telling him I was a bad influence to the class, he said to me, "how dare you shame your family" and taught me a lesson with a 2 inch thick wooden stick wrapped in duct tape. Kid's gotta respect more than his parents imo.