Iran was left on it's own in last 2-3 decades. Mullah regime tried to spread Shia'ism and start proxy wars with other countries. Then foolishly tries to embark on nuclear program which has given them zero benefit and their own country survival is at stake because of it. Iran is stuck b/w two extremes. 1 group who want liberalism, 1 group who wants religious hegemony. I don't see a third option for them.
You don't take on Israel if your own house has leakages. Remember Tipu sultan downfall came from the traitor in his own cabinet? Similarly their fools dream to defend Palestine fell own its own face because moles within were destroying them like a termite.