You are saying that if the US walked away from the deal, that France, Germany, England, Russia, China the rest of the EU would jump in and make business deals, and enrich themselves. Right? So it's about the money then. Except, I'm not seeing any big business deals between the US and Iran. So this deal is a benefit to the US how, exactly? Oh, right. It isn't of any benefit at all. Typical Obama / Kerry deal then. Just like Cuba. No benefit there either.
It doesn't take a mental giant to know and understand that as soon as you show a crack in the wall, the wall will come tumbling down. It would have been better to have not even started the talks with Iran, or at least a precondition to even starting talks would need to be the verified disbanding of the Iran nuclear program.
It certainly looks like the US is under greater threat, greater danger, with this deal, than the US would have been without it. How is it justifiable to place the nation in greater danger just so that a president can claim a foreign policy victory for his legacy?
Operation AJAX? Come join us in this 21st century. That was a long, long time ago.