Like it or not, this is a done deal.

Backing out  now, the U.S. would be alone.

With acceptance , we  need  excruciatingly exacting policing.

Iran – especially the older generation - has  memory and reasons to distrust America - the CIA overthrow of Mossadegh ('53);  the Shah's very mixed record under U.S. support;  the Reagan administration's support of Saddam Hussein's aggression during the 8-year-long Iran/Iraq war (personified by Donald Rumsfeld's trips to Baghdad 1983-1984).

And yet, half the population of Iran is now under 35  and has little memory of these earlier events.  More people of Iranian origin now live in the United States than anywhere else in the world, other than in Iran, itself.  Ties between Iranians, and their Iranian-American cousins are numerous, and presumably play some role in influencing young Iranians - especially in urban areas - towards seeing America in a  positive light.

The upshot is an almost schizophrenic combination of "Death To American" chanters, sharing the country with increasingly numerous younger Iranians inclined to admire the USA.

Like everyone else, Iranians want to be respected.  We should consider this when weighing the wisdom of making public criticism of the current theocratic regime.  At the same time, history suggests we not take lightly Iranian threats expressed against American and Israel.

A mixture of distrust, skepticism,  extreme vigilance against cheating, together with avoidance of gratuitous public criticism and insult, may buy us time until a younger, more America-friendly generation finally holds sway over the haters in Iran.