Do you think that the global prohibition regimes against slavery and piracy constrain state behavior?

Do you think that the global prohibition regimes against slavery and piracy constrain state behavior? Put another way, do you think that states behave differently amid the existence of those regimes than they would if those regimes didn’t exist? How so, and why? Or, are these regimes merely an expression of states’ existing preferences? Again, how so, and why? Or, do you view the interaction of states and regimes in an entirely different way?