Why is history channel so biased when describing the civil war?!?

The new history channel show Gettysburg is extremely biased! It is constantly showing the confederates getting beaten out by the union troops in bravery and skill. This is not true at all! The show displays the confederates as mindless "rebels". Why is the history channel so biased? can they not make one show where they do justice to the bravery and skill of the southern confederates soldiers and generals?