I'm new at this forum but I'm an adventure veteran and love MI since I was a child. So played MI today a second time after waiting couple of years to forget the quest and I came to the conclusion that the Voodoo-Lady is the real evil force in the Monkey Island games.
I think she loves to control the destiny ( ToMI, Episode 2, her laugh in the Intro) and want to have Voodo-might like LeChuck
(SPOILER ALERT: She also takes the jar of LeChuck remains, so maybe she wants his power [which explains the evil laugh at the end of the game])
I'm looking forward to hear from you guys, so leave some feedback please.