A war on the weak and the different often takes on a bipartisan flavor, and is at its most virulent at the extremes of the right and of the left. Ideology trumps morality.
As you may recall, many of our neo-cons came from the far left, making an almost seamless migration to the far right.
Unless one understands the nature of such extremism as being essentially statist, and antithetical to individual life, one cannot see the nature of their otherwise strange interconnectedness and convergence.
The extremes of the left and right can sometimes be kindred spirits, particularly in their disdain for the merely human, in light of the needs of the policies of the State and its models of perfection.