I think Bolton is actually going further then many inside the Bush White House really want to go. What I don't know is if those at the top are unaware of what he is doing or silently allowing it.
Bolton is going a lot further then just saying that we would like the government of Iran to fall or that we will use force in the face of threats. He is doing the same thing the White House did to Iraq. Puffing up the threat here, making demands that that nobody could satisfy, working to prevent any negotiations, and so on.
Not that the rest of the administration are pro-peace of course. But I think most realize that starting another war would be a bad thing. They are hoping that something can be worked out. What I don't think they are willing to do is really negotiate or compromise with Iran, they want Iran to give in to US demands across the board.
Bolton is activly working to derail any chance of avoiding war. And that is what I think puts him further then the rest.
Jay