Don't be fooled by the calls to Sunni-Shia unity.
Iran's conflict with the West is fake. Iran helped the US invade Iraq and Afghanistan. The US handed Iraq over to the Shia. If the US is pro Sunni, why did they put the Shia in charge of Iraq?
Iblees doesn't have a problem with Shi'ism. Iblees has a problem with Sunni Islam. That should be evident unless you don't believe Sunni Islam is the truth.