That's because they thought that sort of discipline was necessary. It wasn't just the parents but society as a whole that felt it was necessary to change those kids. Now society has lost any collective concept of child discipline. All that's left is the kids' own desires and impulses. There's no consciousness of the need for mental and emotional discipline.
Parents just discipline children at home according to their personal whim.
SUWA Discipline isn't a matter of words. I believe parents unconsciously transmit their basic attitudes to their kids. That's always been true. Like father, like son, and so forth. But lately the social aspect of child-rearing has disappeared.