There are plenty of reasons where that is not the desirable solution, say when you got a Prisoner Agreement with the enemy Realm protecting your own Infiltrators. IF you deport them, I always thought sending them to the Colonies was the worst idea, in all honesty.
Or what you can do is be a just and honorable realm that doesn't employ the service of vagabonds and assassins, and not give a crap about prisoner agreements, giving you the leverage needed to spill as much blood as humanly possible.
That's the point of Battlemaster, right? Kill counts?
