And this clip from A Bridge Too Far does an exemplary job of explaining the why, as well as the how. If your time is pressed, fast forward to 3:20:
That is exactly what I want done to them. Come on, we have to face facts; we simply can’t let this kind of conduct go. It’s like the Medical Officer said, once you let discipline go you can forget about getting it back again. So the punishment is going to have to be laid down — hard. Just like it was here.
Hey, when I’m right, I’m right.
Cross-posted at House of Eratosthenes.