The united states has a huge vested interest in this reelection failing. I prefer to withhold my opinion till I hear from BOTH sides of the conflict, and not just from the side that aligns with western interests.
I'd have to say that at this scale, talking about the "United States" as some sort of monolithic entity will lead to weak thinking. Some parts think the mullahs should be lined up and shot, some are pretty comfortable with their control, and there's everything in between, including a lot of opinions that don't show up on this axis. Some are pretty tied into a line about Iran being no threat, some are pretty tied into Iran (and what it represents) being a mortal threat to all civilization.