It would make sense to me then if they are losing control of the masses for them to start a war.One thing we need to keep in mind regarding Iran, is that they are at a pivotal era in their society; there is a great deal of opposition to the current political administration.
They are near a sociopolitical and cultural revolution in their country. This polarity could prove to be very advantageous to both Israel and the United States.
The last thing you'd want Israel to do is unleash an indiscriminate, retaliatory attack on Iran, killing civilians and bringing the two factions together against a common enemy.
Exploit the civil unrest and help to emplode the political structure from within initially, and encompassing it from outside, ultimately.