I wrote:

The strongest argument against engagement with Iran is not that any individual political actor in Iran is irrational, but that the country's leadership is divided against itself and that the warring political fractions are incapable of committing to any sort of international agreement. The green movement added to this disunity.

Kevin Sulivan makes a convincing rebuttal. His whole post is worth reading, but here are the first few paragraphs:]]>