From what I've seen, there is a ton of drama lately about the distribution and use of BLHack and client add-ons designed to crash servers. Not to mention all the DDOS attacks and threats. There are many things being created and used solely for the purpose of preventing people from playing a game.
Why do people do this? Often times it's not even because they think someone wronged them, which still isn't an excuse, but just breaking the game "for the fun of it." Why would someone draw pleasure from ruining other people's fun for no reason?