Crisis? What am I missing?

Why is it a crisis when Iran, a country that signed the NPT, says it plans to resume engaging in activities it is specifically allowed to conduct under the NPT?

I don't want a single nuclear weapon added to the tens of thousands already in place. Having said that, a far bigger story than Iran's pursuit of entry-level nuclear weapons (which has been proven by no one), is that the U.S. is blatantly reneging on its own committments to disarm. That's the deal behind nonproliferation: If new countries don't seek to join the club, the Nuclear Weapons States pledge to get rid of their nukes.

Article VI:

Each of the Parties to the treaty undertakes to pursue negotiations in good faith on effective measures relating to cessation of the nuclear arms race at an early date and to nuclear disarmament, and on a Treaty on general and complete disarmament under strict and effective international control.

How can this committment be reconciled with the December 2001 Nuclear Posture Review? For a nice reading between the lines, see William D. Hartung's From MAD to NUTS? Written in early 2002, it spells out the insanity of Bush's approach to nuclear arms, and issues a still-relevant call for action:

As for the rest of us, we need to raise our voices now to demand real nuclear disarmament, not the bait-and-switch approach offered by the Bush administration. It’s not like we haven’t been through this before. Ronald Reagan came into office in 1981 with guns blazing, pushing for a new generation of nuclear weapons and a Star Wars system. By the end of his second term, however, he had put Star Wars on the shelf and signed on to two major nuclear arms reduction treaties, the Intermediate Nuclear Forces (INF) treaty, and the Strategic Arms Reduction Treaty (START). Reagan’s historic reversal came as a direct result of pressure brought to bear by the nuclear freeze campaign, the European Nuclear Disarmament movement (END), and pressures from European allies and our erstwhile adversaries in Moscow, led by Mikhail Gorbachev, who wouldn’t take no for an answer. It will take a similar international outcry to stop Bush’s reckless nuclear doctrine. The sooner we get started, the safer we’ll be.

For a quite thorough discussion on just how close (or far) Iran is away from a bomb, see the excellent Arms Control Wonk site.