Which is what Congress created them to do. And they are appointed, which the appointers are elected. In essence, they are elected, through the elected representatives which themselves are elected.

This is like saying that the US President is an unelected governmental representative. The population actually votes on a Representative for the Electoral College (EC). The Representatives in the EC then vote for President and Vice President. And yes, the EC Representatives are voted for because they say they will vote for a particular candidate (and as we figured out in 2012, many states have laws penalizing EC Representatives who don't vote how they committed to).