There's little point in killing them like that, they are set up to rejoin another network at random, which means they'll invariably come back to yours at some stage. If you just block the channels the bots use then that is a far better use of resources. If the bot makes a sudden comeback in a slightly different form to resist the attempts to cleanse connections then your kill command will probably kill your server instead. Most networks on Fizzer's list have been connected to 100's of 1000's of times by the infection since it was introduced.
