I agree corporal punishment is cruelty. But some minimal beating must be allowed to put things in order. My mom is a teacher, and back here in the past and to some extent now. Beating kids in school in India was the norm. She tells me many parents would come ask the teachers to not beat their kids, some would come and ask teachers to be ask strict as they can.
Its all in the ideology. But my mom says, on an average my mom says a kid who has been corrected by beating has gone to do a lot well than the ones that hasn't.
Haven't you heard of the proverb- "Spare the stick and spoil the child"
Some times you have to get strict.