Lets have -x reputation give you a %chance of bringing up elite-npcs
with radio-jammers (it's too late to call for help).
Even if this assasin force would always defeat a hated player, what purpose would it serve? It would only mean that a player trespassing in an area patrolled by his enemy faction would randomly die due to dangerous encounters. What good does it provide to the game world? If someone randomly dies in the wasteland and loses some stuff, it's basically all the same to the rest of the players whether this happened or not.