If you wanna kill some Bots on a server without gaining karma you have to be a Bounty Hounter or Treasure Hunter with the skill fake death. Now you can search any spot where bots doing theyre job. Search a aggro mob but hit them only with your hand. Now you have to do that over 20 times (or more) to get enough aggro mobs who are following you. If you have enough mobs together go to the next bot and you can use now your skill fake death. The mobs will now attack the bot and he will die (maybe he drops also ^^). If there is a bot who is logging out cause overcountet mobs just fake death at the spot he logged out. The bot will relog in some minutes and all the mobs will attack him again untill die.
This "trick" is not such easy. You have to do it again and again and you will learn fast how to kill the bots.
PS: On retail i got much drops from them like FP Helmet, FP Shield, Brig, and also much mats. Best one was 1023 CBP
Greez and HF