Just think of them as a decapitated corpse on our gate. They'd be like a "Mind the dog, trespassers you've been warned!" sign.
The problem with that is then who do you fight? Far better (from a purely OOC perspective) to leave your enemies alive to fight another day, otherwise you'll eventually have to turn on your allies/vassals in order to create conflict. This is the future that will probably confront SA at some point. I just hope the Dev team implements schism mechanics in time for us to epically implode and start killing each other
