You may be surprised how many who called themselves "Christian," and even many conservatives on this site (just a few of which I have contended with), who oppose any corporeal punishment of children - despite it, as wisely judiciously applied, and as based upon principal, not peevish passion, is clearly Scriptural, though more necessary for some (if all all) than others.
And indeed, in the natural world, it is the reality of physical force that is ultimately behind even the demand "go to your room." For what if the child refuses to mind, and parents never use physical force? If one will not be correctly controlled from within, then they must be controlled from without. Resulting in the state getting involved. And whose power to coerce obedience ultimately rests upon the use of the sword of men, with the just use of it being sanctioned by the word of God. (Rm. 13:1-7)
Yeah, immature individuals, not just chronologically young, get the idea that nothing can stop them. Until something does. Then they bring in Child Services or the Law against the parent. And WIN!
Dr. Spock has no tool with which his followers can deal with obsessive oppositional defiance (click here).
Whole books are written describing and diagnosing this disorder, but when deeply rooted, there does not seem to be a cure other than amputating the person's twisted soul from his/her physical body--a sort of deadly mental infection of the soul akin to the methecillin-resistant staphylococcus aureus (MRSA) infection of the body.