You're using extreme examples of moral bankruptcy to demonstrate that all morality is simplistic?
Hitler? Evil f**kwit, we agree.
Taliban who hijacked the plane? Evil f**kwits, we agree.
The guy on the street who shot a known pedophile after the legal system failed to deal with him for over a decade? Do we agree on that? Can we? Was this man justified? Was he not? If he took it too far, does this make him evil? If so, why not?
See what just happened? That was a moment of moral complexity. It's a question that we would not come to a neat and tidy consensus on. If true morality existed, we would all be able to say 'he's bad' or 'he's good' with zero discussion, but the matter is more complicated then that. Believing otherwise is delusional.
