The attacks, the official said, were in retaliation for the assassinations of Iranian nuclear scientists, for which Iran has blamed Israeli agents — an accusation that Israel has neither confirmed nor denied. “This was tit for tat,” said the American official, who spoke on condition of anonymity because the investigation was still under way.
Hezbollah Is Blamed for Attack on Israeli Tourists in Bulgaria, New York Times, July 19,2012
The Obama official is wrong.
This is not an issue of "tit for tat".
This not even an issue of Iranian scientists.
This is about a war of terror committed against Jews and Israelis.
Jeffrey Goldberg notes that Iran's war of terror against Israel has been going on for decades:
