Scoring isn't everything. A great defender can have as much of an impact on winning as a scorer can. The goal is to finish with more points than the opponent, so it works both ways—neither trumps the other no matter what SportsCenter tries to tell you.
But for some players in this year's postseason, their struggles on offense have been so tragic that it's hard to say that they have been able to make up for them in other areas. If the opponent doesn't have to guard you at all, it just makes life that much more difficult for your teammates.
These guys have made their teammates' lives difficult.
(The list ranks the worst scorers per 36 minutes in this year's playoffs. Minimum requirement: 15 minutes played per game in which the player saw action.)