Red and Blue

The News Media for decades now have screened maps showing places that favor Democrats in blue and those that favor Republicans in red. 

Why this plan?  It seems fairly clear that the MSM chose this scheme to confuse as much as possible the facts that true-blue Americans generally vote Republican while the Reds generally vote Democrat. 

What is not clear to me is why Republican commentators and the Fox News organization have gone along with this propagandist scheme.