The problem is that Bush is not concerned about nuances and never has been - he doesn’t know how to use public opinion. Ahmanutjob obviously does. If Bush were stronger in public, this guy wouldn’t dare to keep on not only with his taunting, but with his actual evil deeds - killing our troops in a country that is not his, for example.
Pres Bush has nothing to do with Irans penchant for evil.