Heratick

To be assholes, or find a backdoor in the server, stealing information and what not. You try and find out where it's coming from and you stop it.

Here, here! I'll toast to that.

What's the problem here? Would you rather have it that no one was on the server? Not able to run any dungeons, or do quests that require a group? Personally, I would much rather have overcrowding. It makes the game feel alive, and brings me back to vanilla WoW. It was pretty crowded in those days IIRC.

Distributed Denial of Service, essentially extensive pinging the server until it overloads and crashes. To put it simply.