Structuralist criticism formed at most 1/4 of the post.
That structures in society and discipline practices are used to enforce respect for hierarchy's of power is something that is explicitly acknowledged by many of their traditional practitioners. This practice is obviously going to be controversial with those who believe in liberal values, I've read a bit on this, but obviously I could express and develop these ideas further, which is the point of having a discussion.
If you have any actual criticism.
My criticism is a detachment from the realities of parenting and society. My parents, in smacking me when I acted like a dick, were not harshly forcing me to confine to the power-relations of society: they were telling me not to act like a dick. We do have to draw a line between beating and smacking, and I am referring to the latter.
It builds an innate sense of consequence and of responsibility. Relations, ethics and decorum in society are not genetic things. They are entirely learned, of course.
To read into this act of reinforcement an intricate display of power-relations and their demonstration is to impose what is not there. It teaches kids, who do not fully understand concepts such as money, economics and the real world, that there are consequences if they decide to throw their parents plates on the floor or draw over the walls; they won't fully understand them beyond the fact that they'll get a clip over the ears, but it's important that there are consequences.
Children raised without consequences tend not to be particularly healthy ones.