The fact is, Nuclear weapons are still a threat, but even though that fact holds true, the cold war died nearly 20 years ago.
We live in a world of asymetric warfare and regional conflict, and numerous geurilla hit and run attrition battles.
We don't really rely on big superpowers manipulating the scenes as much, considering USA has gone into a free fall with its economics, and Russia is just climbing to its former spot, since it's still recovering from its implode when the Soviet Union fell.
China is having problems with regional matters, and they are still trying to supress and "teach" their mass labour force that if they ever were to be as spoiled and brat like as us Westerners, they would probably bankrupt the earth of resources.
But now, we live in a world that is plagued by numerous insurgencies, and not of which all of them are by cruel evil extremists. Rather, its a bunch of average folk, like you an me, who are trying to make their country better to live in, and they can't jsut migrate. Even with open and easy going countries such as Canada and so on, there arent enough spots and the waiting list is long, as well asthey probably lack the funds. So they had to turn to war, and they were scraping by to begin with, so they resort to being geurilla's, or as many of the dictators and tyrants in these nations call them, "terrosits" or "insurgents".
Yemen is a good example of this.
Whatever the case, Iran should be allowed to have Nuclear missles, considering that if you count the warheads that are around today for the USA alone... You get close to 10000 disposed warheads. But That does not mean the radioactive Nuclear material is disposed of, and all it takes is a few corrupt officials to let their eyes wander and then its on the black market. So in truth, we can never, at least in our, our childrens, or even our grandchildren's lifetime's could we ever disposes of all the nukes, besides detonating them all. Even the nuclear storage facilities are overflowing, and now its a hazard to the enviroment. Cherynobyl, the worst disaster in hsitory, is still a hazardous pile of nuclear waste. even the animals there are all mutated and disformed.
So if generally the BIG 5 are allowed nuclear weapons,(china, russia, Britain, France, USA.) and other nations such as India, North Korea, Pakistan, Iran, and even Germany, allowed Nuclear weapons, why cant we allow them to, at least have that as a sign to keep invaders and other types of harmful intruders threatened in a general sign, IF YOU STRIKE US, WE BOMB YOU.
I dont see any harm, just keep with its good side, and if any other lowly and right wing nations want nuclear weapons, send in inspectors beforehand, and keep the anti nuclear policy so they never have weapons in the first place. Iran will be our new ally in the middle east, just make sure the Iranian President is on good terms with us.