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For years now, Iran's nuclear program has been presented as one of the greatest threats to world peace and prosperity. If this argument is to be believed, then the course is clear: finding a way to prevent the creation of an Iranian bomb should trump almost all other considerations.

And that's pretty much what's happened.

But since a tentative deal was struck between Iran and the so-called P5+1 – the US, Britain, France, China, Russia, and Germany – many in Washington and Israel have been throwing up new demands to be imposed on Iran before any final accord is signed. For example, that Iran must first be deemed to no longer sponsor terrorism, as many Senate Republicans insist, or that the country recognize Israel's right to exist, demanded by Israeli Prime Minister Benjamin Netanyahu.

To be sure, Iran supports armed groups like Hamas or Hezbollah, has a terrible human rights record at home, and is keen on expanding its regional influence. But those are separate issues from its nuclear program. And they make an agreement on curbing that program much harder, it not impossible.

That's a problem for those who want to keep the bomb out of Iranian hands. If a deal fails, many worry that an Iranian bomb would become inevitable (Iran insists that it has never sought to build a nuclear weapon). With crushing sanctions and no prospect of a negotiated settlement, Iran may reckon that racing for a bomb is worth the risk. Or they kick out nuclear inspectors, leaving the international community blind to what it's doing and thus intensifying the alarm whether it was pursuing a bomb or not.

Nonetheless, Mr. Netanyahu and hawkish US lawmakers appear ready to torpedo any deal.

Howard LaFranchi wrote for the Monitor yesterday about the Senate's effort to pass a law bundling in "terrorism" with the nuclear deal (though there are indications today that effort may have been abandoned):

So why, with the prospect of a final deal (which still may not be reached) on the horizon, are so many inclined to shift the goal posts on Iran? It may be because, while fear of Iran's nuclear program is real, it's not the only agenda. Just as important for many players is to contain and weaken the Islamic Republic that has held power since 1979. And if sanctions are lifted, Iran has vast oil reserves, a large population, and a history of cross-border commerce that make it likely to become a stronger regional power. 

Shifting goal posts on this matter are nothing new, nor is the conflation with a desire for regime change with sanctions over the nuclear program. In March 2012 Netanyahu said sanctions weren't having an effect on Iran's nuclear program and complained "the regime strengthened its grip in recent elections, despite the sanctions." Now he says the sanctions have "proven effective" and should remain in place.

And while US hawks have long labeled Iran's nuclear program as an overwhelming, A-1 priority threat, their opposition to lifting sanctions can be perplexing. For example, critics raise the rights of gays and women in Iran as reasons not to do business there. The same surely applies to Saudi Arabia, which buys billions of dollars worth of weaponry from the US each year. 

Thus, it gets harder and harder to escape the impression that for some of the opponents of Obama's diplomatic efforts, it isn't the nuclear program that they cared about curtailing so much as the Iranian regime itself.

Netanyahu's recent comments to his security cabinet, after the outlines of a deal were agreed at the start of the month, bring this into focus. Haaretz reports that Netanyahu said after the framework deal was announced his "biggest fear" was that Iran would comply fully with its terms.

To be sure, part of Netanyahu's fear is that Iran will seek a nuclear weapon when the current plan sunsets. But in that case a 10-year delay seems a less scary prospect then no delay at all. And Iran could try to cheat – but that's true today, too. Either way, Iran's commitments under the Nuclear Non-Proliferation Treaty don't allow it to seek nuclear weapons under any circumstances, while also promising it a right to a peaceful nuclear program.

It's certainly true that Iran will have more latitude for action if it satisfies foreign powers that  a nuclear weapon is off the table for now. Russia yesterday promised it would deliver an advanced missile defense system it sold to Iran in 2007 but has delayed sending until now.

The S-300s matter to Iran's defense of its airspace – and its nuclear program. They make it even more unlikely that Israel would attack Iran, and even the US might reconsider any bombing campaign. Iran's position is that it has a right to defend its airspace and that sanctions have been as much about keeping them conventionally weak (relative to regional rivals) as they have been about nuclear weapons.