On a certain level this makes sense.
At one time, belief in Satan as the ultimate evil in our world to which all other evils pale in comparison, was a widely held belief. As our culture has modernized and secularized, this belief has largely disappeared. But when Satan disappeared, someone or something had to take his place. Thus it has become very easy to believe that the Republicans or Democrats or whoever happens to be on the opposing side of whatever the big political issue of the moment happens to be, is the ultimate evil and must be treated as such. This explains a lot as to where we are in our current level of political discourse.