Well when you think about it, everything a mod can do, can be undone.
There's always someone on and even if a mod went rouge or there was a hacker and he banned everyone online at the time someone would log on and notice all the bannings and tell another mod or david. Besides, if a mod can only ban user 1 at a time then it would take awhile for a hacker/rouge mod to ban alot of people. Even if the hacker was able to ban say 50 people before it was noticed those bans could be undone by david. Yeah it would be a pain in the ass for awhile doing the damage control but it all could be un-done.