Conclusion
Peterson is the most intelligent and well-argued advocate of aggressive parenting that I’m aware of. Yet he makes no valid arguments for the use of aggression in parenting. He can’t, because there are no good arguments for using aggression on children.

To make his defence of corporal punishment he had to ignore all the research literature on the bad effects of spanking. He had to rely on a controversial and outdated school of thought in psychology (behaviourism) as the only authority he could appeal to in trying to justify his aggressive style of dominance assertion against children. He had to ignore the entire field of child psychology, none of which supports spanking or aggressive parenting. He had to cherry-pick ideas from evolutionary psychology that seem to support aggression, whilst ignoring evolutionary psychology when it leads to promotion of practices such as co-sleeping. His arguments are so weak that he resorts to rhetorical techniques like asserting that anyone who disagrees with him is wrong and holds views that are “too simple”.

Peterson’s chapter on parenting is called “Don't Let Your Kids Do Anything That Makes You Dislike Them”. But that that is a mealy-mouthed way of stating his views. He should heed his own advice and take responsibility for his views, which means not using the passive tense. His chapter should be titled “Don't Let Your Kids Do Anything That You Dislike Them Doing”, because that's what he is really saying. When you put it like that, it amounts to merely saying “Don't Let Your Kids Do Anything That You Don't Want Them To”, which is neither deep nor enlightened. It is merely a sophisticated excuse for indefensible aggression against children.