His support for the Iran war could be that he genuinely believes it

I suspect there’s a bit more nuance involved.

Most people would agree that the Iranian regieme is/was bad for both their own citizens and for the region.

But at the same time, what the Israelis and Americans did by starting a war with Iran is also a bad thing for the citizens of Iran and the region (and the rest of the world). Even if it did disrupt that immoral Iranian regime.