I would imagine that Iran, if it had any sense (debatable I know) would already have retaliatory capability in place within the USA for massive overwhelming counterstrike.

That would entail existential risks for Iran. If WMDs were found in the possession of Iranians in the USA there would be unbearable pressure to retaliate against Iran with 'regime change' as the goal. Absent a clear Iranian provocation against domestic US targets the situation is much cloudier. None of the recent retaliations against Israel have been in countries that could hurt Iran.

"It is not necessary to have hope in order to persevere."