Hugo Grotius, the founder of a purely rationalistic system of pure law, argued that law arises from each a social impulse—as Aristotle had indicated—and cause. Immanuel Kant believed an ethical imperative requires laws “be chosen as if they should maintain as common legal guidelines of nature”. Jeremy Bentham and his pupil Austin, following David Hume, believed that this conflated the “is” and what “must be” problem. A group of England followers had been surprised and frustrated by the introduction of an alcohol-free zone at Twickenham for the Six Nations match towards Wales on Saturday. The grieving father of Kelvin Kiptum…