I think the GP was saying KSA is Iran's enemy.
Edit: brain failure on my part.
Edit: brain failure on my part.
As far as Iran is concerned SA attacked the US, Bin Ladin is from there, as were most of the attackers.
At a high level the US and SA governments are not enemies, but at a lower level (the people) it's not so simple.
Assumptions are harmful. Iranians on the other hand have a genuine reason to hate the US. Iran funds Hezbollah which have attached American interests in the past. It was Iranian-aligned militia that wrecked the American army in many battles in Iraq.