There's a scene in the last of the three Lord of the Rings movies in which valiant hobbit Sam rescues his captive friend Frodo from a tower in the heart of an evil stronghold.  In the process, he kills a good number of orcs.

Did you cry for them?  Did you worry about any orcish widows left waiting by the window?  Little orclings wondering when papa was coming home?

Of course not.  You cheered Sam's courage and didn't give a second thought to the orcs.  Why?  Because... they're orcs.  They're ugly, vile, evil.  The very definition of other.  

Now, wherever I wrote the word "orc," imagine that it said "liberal."