No, I don't blame Steve Bartman for costing the Cubs a World Series win. There are many factors that come into play here. Essentially, one team did better than the other. It's as simple as that. Teams compete. They win, they lose. It's not the fault of any ONE individual when an entire team loses.
No, Steve Bartman is not the reason the Cubs didn't win the World Series. The fans of the Cubs have been ridiculous all of these years blaming a fan for them losing instead of the players on the field. In that same game where he interfered, they still could have won that game, and it wasn't the World Series. Steve Bartman has been a scapegoat for the fans because their team hasn't been good enough. When Bartman reached for that foul ball, he wasn't the only fan reaching for it.
While I am a believer in the superstitions and curses that come with baseball, Steve Bartman was only a cause from an earlier curse that was placed on the Cubs called the curse of the goat. There was a man that was a long time Cubs fan and when the Cubs were on their way to making the playoffs, the fan got a ticket and when he went to go to the game he brought his pet goat. Security didn't let him take in the goat and after much debate the man left, but not before placing a curse on the Cubs franchise stating they would never win the World Series. The Cubs went on to lose the next seven games and missed the playoffs. Not to mention the Indians are a great ball club, with a phenomenal manager and they are playing in a city that seems to be filled with metaphoric magic.
The Cubs have not lost the World Series yet. They could still win. Steve Bartman is not doing well against the Indians and it is a good thing he is not attending the game. The Cubs were not in the world series when he caught that ball and changed the outcome.