Just to clarify: I'm all for the deal with Iran, hoping for a better future for the Iranians.
Especially for a country that's been at war with its neighbours for the last 50 years at least, in a chaotic region filled with international terrorists groups and active war zones right at the moment.
I don't actually consider myself a particularly knowledgeable individual when it comes to Middle Eastern history. But when people say things like this, they usually include all the marginal entries the US is involved in while ignoring all of the marginal entries other countries, presumably mostly out of ignorance. Particularly if you include "little" conflicts, you'll find that most countries spend most of their time in armed conflict with somebody, and the US isn't particularly abnormal in this regard.
When everyone can hurt everyone regardless of size you get a "mexican standoff" which is good for stability
It seems to fit all of your criteria.
I'd be interested to hear a rational argument for why it's okay for Israel to pursue nuclear weapons but not a neighbouring county? (Please don't resort to some quote about Iran hating Israel, as Israel have said equally extreme things as well).
Stupidly naive answer: because Israel didn't sign the NPT and is voluntarily evasive about the subject, while Iran did.
in short, the situation of the two countries is far from being symmetric due to huge geopolitical differences.
Japan actually invaded half the world, they have nuclear technology and capability to produce weapons. Same as Germany, Russia, and of course the US. You have countries like Pakistan that is a known host to "terrorists", and India that have them. Why is there a special club?
Iran have violent "rhetoric". What violence against israel has Iran actually perpetrated? The israel situation is a controversial one, and there have been threats, and wars. But Israel has generally been the more aggressive one, and always because they are facing "total annihilation" (for fifty+ years, in which their borders have increased rather than decreased)...
I really didn't think i'd ever have to make such obvious statements.
Scaling down the political violence is the only way to get out of that mess.
I must admit some bias here: I am a U.S. Citizen and I firmly believe that better relations with Iran are in my country's best interest. I am biased in my country's best interest!
Right now, there are many young Iranians who are neutral or slightly pro-USA (they are too young to remember that we helped overthrown their democratically elected premier in the 1950s and installed the Shaw of Iran - we rememebr how that turned out for the Iranian people).
So, yes some risk, but for the USA I think the risk is very worthwhile.