Iran and Egypt were and are very different places, with very different political dynamics. But the fundamental nature of the decision that is required today by the United States is not very different from the dilemma faced by the Carter administration three decades ago. Should you back the regime to the hilt, in the conviction that a change of leadership would likely endanger your most precious security interests? Or should you side with the opposition — either because you agree with its goals or simply because you want to be on the “right side of history” (and in a better position to pursue your policy objectives) once the dust has settled?
Of course, there is a third way. You may try to carefully maintain your ties with the current ruler (see Biden above), while offering rhetorical support to freedom of expression, democracy, and human rights. Regrettably, as the Carter administration can attest, that may produce the worst of both worlds. If the ruler falls, he and his supporters will accuse you of being so lukewarm in your support that it was perceived as disavowal; whereas the opposition will dismiss your pious expressions as cynical and ineffectual.
The Worst of Both Worlds