History is long, and I can't say it with as much definitive certainty as you (I wish you'd cite your reasoning), but as far as I know the reintroduction of sanctions against Iran will cause economic hardships which will radicalize a lot of people, and which will cause further instability to the world.

The same kind of hardships that also radicalized Trump voters, it lead them to vote a populist fascist into power.

Of course if Iran or Iranians cause trouble in the future, you'd use these as an excuse to say "Trump did the right thing, see what they did, they deserved those sanctions!", ignoring cause and effect: without the sanctions, they wouldn't be that pissed off to cause these troubles.