I have been wondering this for long time.
Why is it so hard for people to listen and do what raid leader says so everyone can get the boss down or achievement done? Its like people are just somekind of bots that just follow that logic "run and kill everything unless you die". 95% of time its hopeless to try any kind of achievements etc with pugs.
Really, what the fuck is wrong with people? Im sure they see chat messages, they are not blind since they are playing this game at the first place. And if they are playing this game then they should have required intelligence to follow some easy steps in tactics. This game is not rocket science.