Mahdi this is where you need to rethink the entire thing. Iran is not and should not benefit from Trump pulling out. Why should Iran benefit from anything these days? Why exactly is Iran due a 'benefit'?
Ok we're all Iranian and wouldn't mind Iran benefiting in some way, but it would be illogical to expect it.
Trump pulling out is not a good thing. It won't result in I.R falling. It will make Iran poorer and more miserable for a good while. But why is this not acceptable given Iran's general culture, government, voting history, revolution, ideologies and actions?
If you think about it, Iran is actually not being bullied by anyone. For a volatile country with fairly shitty behavior, Iran has actually been quite successful at deciding its own fate and continuing its juvenile ways. No other country would've been allowed to behave like Iran. I can't find a single example.