in you example contras more like barbarians spawned by slave revolts, and their "civilian targets" just workers and other non military units. Their attacks never drop civs borders, alowing neighbors to occupy it territory. yeah.. just like declare war on USA in answer on contras attacks I m not against assassins, but its current implementation is huge disbalance. i like to see them as civ-neutral units expensive to support. And it will be allowed to destroy them.