Yeah, Lewis's take seems to be that if you don't keep the pupils on the hop as much as possible with lessons and compulsory games, there will be nothing but bullying all the time - because of Fallen Human Nature, or something?

I will cautiously admit that progressive schools did tend to have a problem in that many parents were likely to send their children there only when more conventional establishments had already, sometimes several times, expelled them as intractable. But I don't think Lewis is making any sort of nuanced case!