That idea is insane. Countries must protect their sovereignty. Ireland is right to respond to Israeli forging of its passports. Sovereign nations just can't tolerate it.
What are you gonna say when other countries forge US passports to commit assassinations? Hey, why not forge passports and frame other countries for the assassinations. Hey, how about this idea. What if another country forges US passports so that they can enter the US to commit acts of terrorism or assassinate US citizens?
If it's a civilized country killing a member of an organization that's an enemy of Western Civilization I'm prepared to look the other way.
You don't see any connection between this (Israel has refused to confirm or deny its agents' involvement in the January slaying of Hamas official Mahmoud al-Mabhouh, who Dubai officials have said was killed in his hotel room by people posing as holidaymakers in the oil-rich Arab emirate. )
and the Irish ship, the MV Rachel Corrie, being used to break the quarantine on Hamas-controlled Gaza?