"So far, the Iranians have been restrained, choosing not to even retaliate with low-level attacks"

"... An Iran specialist, with whom I spoke recently, posed a challenging question:  At what point are the Iranians forced to take action against this clandestine war?  There have been bombings, kidnappings and assassinations on the streets of Tehran that have been impossible to conceal from the Iranian population.  Is this going to prove to be a war delay/war avoidance strategy, or a provocation that leads Iran to retaliate and provide Israel or others with the pretext for general war?  This question is yet to be answered.  So far, the Iranians have been restrained, choosing not to even retaliate with a low-level attack on Israeli or American targets outside of the region..."