Sneaking back a bit of booze for personal use from on det is one thing.
Everybody expects and knows that happens and most in command while not turning a blind eye to it will allow personnel some leeway within reason.
However when morons decide they wish to engage in private enterprise like the alledged incidents then you have no option but to tackle head on.
When people go down the route alledged, they then start to make decisions which are primarily in their own interests, rather than in the interests of the service as a whole. Also they are more likely to take risks because of the greater pay back.
The question will be raised that how can people believe it was only cigarettes and not Afghanistan's other famous export.