Assuming these sociological studies are robust (which they're likely not as sociological studies have poor reproducibility) am I also supposed to reject the evidence of my eyes and ears? Families have been destroyed by terrorism in the UK, by terrorists who have been given second and third chances.

To link this back to the original topic: discipline of children is part of a wider topic of how as a society we discipline those who fall out of line. Discipline in society determines the kind of future we're shaping for ourselves.