Hooman Majd argues that the Iranian opposition is not trying to overthrow the regime:
What is evident is that if we consider Iran's pro-democracy "green movement" not as a revolution but as a civil rights movement — as the leaders of the movement do — then a "win" must be measured over time. The movement's aim is not for a sudden and complete overthrow of Iran's political system. That may disappoint both extremes of the American and Iranian political spectrums, left and right, and especially U.S. neoconservatives hoping for regime change.
He also says that violence is not widespread among the green movement:
The radical elements claiming to be a part of the green movement only speak for a small minority of Iranians. The majority still want peaceful reform of the system and not necessarily a wholesale revolution, bloody or otherwise. That’s why, in the most recent Ashura demonstrations, for example, large groups of peaceful marchers actually prevented some of the movement’s radicalized elements from beating or attacking security forces. Although accurate polling information is not available, based on what we hear and see of the leaders of the green movement and many of its supporters, radicalization is still limited to a minority of protesters.
(Hat tip: RaceForIran)