I think you have it a bit backwards.

The reason we have Iran with an insane government and all the princes and total lack of democracy is BECAUSE of all the interference due to oil.

America and before it Britain and the colonial powers just walked in there and stole everything and so now the region is divided into countries that were soccuessfully captured (Qatar etc) and countries that threw us out (Iran).

If oil wasn’t as important it might be chaos for a while though because this dictatorships are propped up expressly so they can sell us cheap oil.