There's this wonderful piece of schtick Lenny Bruce used to do, something like:-

I'm from New York. Let me tell ya, corruptions no big deal. In New York, we grow up with it. Everybody's corrupt. the cops are corrupt, the politicians, the newspapers...... When i was a kid, I figured I was probably corrupt as well.

what Im trying to say is, let's take it as a given, everybody is corrupt

I believe the catholics have a phrase for it, they call it original sin.