Not all Americans supported the Iraq invasion.
In Saudi Arabia -- literally, the Arab lands belonging to the House of Saud -- the subjects don't have that power. They would have to have a revolution, first.
says that this varies state to state, with Maine and Vermont allowing people to vote even while in prison.
https://www.theguardian.com/world/2017/nov/06/how-saudi-elit...
Also, just because not everyone in the US supports their government, it doesn't mean that the government isn't using "blood money" to invest in their own future.