ok so let me get this straight, america/ britain and isreal want to keep nukes but they wont let countries like iran, north korea and pakistan keep theirs?
Of course.
the international norm (known as the Nuclear Non-Proliferation Treaty- NPT) accepted by most countries, including Iran, that only five countries are allowed to have nuclear weapons: the US, Britain, France, Russia, and China.
India, Pakistan, and Israel never signed the NPT, North Korea withdrew from the NPT in 2003.
Now, India and Israel never gave nuclear assistance to terror regimes and are considered democratic and responsible countries.
Pakistan helped rogue regimes to develop nukes: Iran, Libya, and North Korea. Pakistan offered asistance to additional regimes: Saddam's Iraq, KSA, Syria. Pakistan's nuclear scientists offered assistance to OBL, just 3 weeks before 9/11. And above all, Pakistan can easily fall as a pray to radical Islamic regime which consider its nuclear weapons as "Islamic bomb" and threaten international security.
North Korea cheated the world: It promised not to develop nukes and received international assistance, but developed a clandestine nuclear programme. Furthermore, NK helped Syria to develop a clandestine nuclear programme.
If Pakistan and NK got their way all the countries in ME would have nuclear weapons, and regimes like Saddam, Qadafi, Asad. This blood thirsty dictators could murder their people, terrorise their neighbours and no one could remove them. If Pakistan got its way, OBL had dirty bombs to terrorise and murder much more innocent people than he did in 9/11.
Iran do the same thing as Pakistan and NK: tried clandestinely to develop nuclear weapons although it is committed not to do it, and is ready to use its nukes to terrorist its neighbours and take control on the oil reserves of the ME. Iran's nukes will be use as deterrent to enable its terror organisations to undermine regimes in the ME and butcher innocent people in Israeli and other countries. Iran is also eager to assist more countries to develop nukes.
That is why all of this countries should be without nuclear weapons for the sake of international security and the survival of human kind.