"Child abuse" is a fuzzier term than many seem to acknowledge, subject to passing conventions and fads. This isn't to say there aren't obvious examples of child abuse (beating your kids, sexual abuse, gaslighting, or all sorts of emotional and psychological manipulation or whatever), but today, giving an incorrigibly disobedient child throwing an interminable tantrum a swat on the tush to shake them out of it gets CPS involved, but teaching strange ideologies approved by the state is fine (in fact, refusing to teach them is now abuse). Even worse, grotesque "medical" procedures and treatments against which that swat pales in comparison.

Generally speaking, corporal punishment as such is not abuse, either. We've just become very sentimental, operating with a flawed understanding of human nature. It shouldn't be used lightly, but it shouldn't be demonized categorically.