At least one country seems to be at least giving the impression that illegally using its passports in murder is unacceptable:
Britain is to expel an Israeli diplomat over the use of forged UK passports by the killers of a senior Hamas official in January. The foreign secretary, David Miliband, will make a statement to the House of Commons this afternoon, blaming Israeli intelligence for the cloning of passports belonging to British citizens. The documents were carried by an assassination team that killed Mahmoud al-Mabhouh in a Dubai hotel.
British officials said Miliband would “request” the immediate departure of an Israeli diplomat, adding that they expect the request to be honoured. “We think they mucked around with our passports, and we believe that requires consequences,” an official said.