TB, essentially I agree with you. However, I think that FFC's desire for a dramatic scene dominated the screenplay formulation. Certainly, Micahel could have come up with more practical (and less dramatic) scenarios in which Roth would meet his doom. For one, if he could bribe several governments to not admit Roth, then he could bribe them to admit Roth and hold him until he could be dispatched.

Nevertheless, I don't support the interpretation of Roth's murder as a way for Rocco to prove loyalty or as a penalty.