Why does that surprise you? The Iranian government is hostile to the US.
The fact that the protests aren't spontaneous and have to be sponsored by the government demonstrates that there is not widespread animosity towards America in Iran, or at least not moreso than most other countries. This thread is about the Iranian population, not the Iranian government.
Most Iranians were born after the Islamic Revolution and the hostage crisis.
Current polling shows massive support for the dog admadinejihadist, close to half the pop, and the Basij - the True Believers - number some 11 million. That's alot of people and is why I support a military strike to conduct regime change; it is like Nazi Germany or Hirohito's Japan, the people for the most part support the current awful government because they are not really being made to suffer directly the violent consequences of its militaristic adventures.
Just like in WW2, once the supporting populations began to be bombed like their armies did to the rest of Europe, their support for the War decreased significantly.
Nothing would please me more than to see Israel and a few other nations establish proxy armies on Iran's borders and lob missiles, mortars and rockets into iran aimed at civilian population centers, and to detonate bombs inside iranian malls and shopping centers.
I think that once they have been made to endure the shit these fucking assholes have put so many others through, they will cease their support for it - political opportunism via terrorism.