In the case of lying or dissembling, the purpose is to mislead and create a destructive goal. "Bastard" is a subjective opinion but if you err too much in accepting the psychopathy as being "just another point of view", this is a form
of enabling.

Was Hitler or Osama a bastard? Would you say they weren't?

Name-calling carries with it a function of anger without which there would be a clinical acceptance of destructive behavior since you can rationalize almost every
misdeed known to mankind. I think that "lying bastard" can go together as a passionate outcry of recognizing injustice.

In lieu of the terminology, "lying bastard" you might substitute "sick and twisted" or "crazy" or "murderous" but taking the onus off of the destructive behavior of some of the Washington establishment hardly seems reasonable in light of what some of these "egregious" politicians, mostly on the radical GOP side, are doing.
I think "lying bastards" is appropriate.