Gogo was played by Chigusa... and she does play a damned good psycho... but what would you do if some dude, in the middle of a game where you have to kill off all your class mates, came up and said... "Hey, nice shoes, let's fuck." And held a cross bow to your head... you are legally allowed to go a little crazy...
And Gogo did have the best weapons.

Btw, did you read the book. see the movie. or both?