TB, we have to consider Vito's and Michael's intent. That intent was to dominate, period. Kay stated it perfectly: "Reason backed up by murder." Neither of them had any affection for society's rules, laws, or an enhancement of the human condition.
We as a society heap a large measure of scorn upon those who depart from the rules and laws. We admonition and recriminate such departures because we generally adhere to the social contract.