Influenced Progressive Choice vs Free Will

In the cusps of ever decision there exists a moment of hesitation in which you doubt your initial decision and wonder if the benefits outweighs the costs. In this series the killer not only takes on the heavy burden of judging those who make relatively corrupt choices but also punishes the chooser in somewhat dastardly ways.

How can a killer judge others when he has no right to?

Or to what standard is a choice corrupt? Is it based on the amount of harm it brings towards others?