It was easy to blame Bartman, but he did not do anything any fan at any game with a chance to catch a ball is ALWAYS going to do.
The real villain was and always will be Dusty (The Clown) Baker. That idiot violated just about every critical rule of managing that night. He is the real reason the Cubs did not get into the World Series that year. Dusty just stood there with his thumb up his ass while his team fell apart on the field because he did not yank the pitcher until long after it was too late.
I'll always despise Baker for that because 2003 turned out to be the last year my dad, a Cubs fan since his boyhood in northwestern Indiana, was alive to see a playoff and a World Series.
Here is a link to an excellent article about that game. It reminds us that Alex Gonzalez blew an easy double play that would have ended the Marlins at bat with the Cubs up 3-1.