By Mullahs not thinking rationally, I mean the Mullahs think in terms of their own self interest, not the broader good of Iran or Iranian people. Self interest and self preservation are particularly applicable to totalitarian regimes such as IRI.
That is why IRI steals & squanders Iran's national wealth (more interested in providing support to terrorist organizations such as Hamas and IRI created Hezbollah), and maims, starves, prostitutes, beats, jails and kills its own citizens and plays power games externally with the West to maintain power and control.
"Compare the power they have with the power and influences the clergy has in western countries."
There is no comparison because the clergy in the West are not in charge of a government of a country.