That is true, but there are several differences:

1. A TB member can not decide anything on his own. All TB decisions require a 2/3rds majority so a member with a prejudice is going to have to explain his reasons to the others if he hopes to convince them.

2. TB decisions are publicized -- meaning that you would be able to see who voted in your favor and who did not.

3. TB members are elected for a two year term. Those who engage in vendettas are liable to find themselvs voted out.