These are the most stable countries in the region because they are the only countries in the region allowed to be stable. Iran is by almost any measure a better country to live in than Saudi Arabia, except that it does not do the bidding of the US, so it is getting illegal sanctions imposed upon it, almost officially recognized industrial sabotage, it is cut off from world banking etc.

Note: I'm not claiming Iran is some tortured paradise. It is still a brutal regime, with horrible regressive views and which is acting tyranically towards its own population. It is much worse than Israel in that regard (though at least Iran is not waging a war of aggression on a neighbor sattelite state, and defying UN resolutions and international law in doing so). But it is still significantly better than Saudi Arabia in almost everything to do with human rights.