If they strike Bushehr - and there was a strike on the complex on Tuesday evening, just not near the reactor - the humanitarian disaster wouldn't be limited to Iran. The likely consequence would be a Fukushima-style discharge if the cooling systems are damaged. This would mean having to take desalination plants offline to avoid radioactive
contamination, and a lot of Gulf states are mostly or exclusively reliant on desalination for their water. Same deal with any sort of refinery that uses sea water for cooling. They've got limited amounts of groundwater, so it'd likely mean water rationing and a serious hit to basically every Arab economy. You'd also have a knock-on impact on fisheries, which aren't massively important but it would destroy some of their culturally important fishing villages. Obviously this would all make the global crisis worse too.
Worst case scenario would be a spent fuel fire, at which point the Gulf is effectively irradiated and would be for months or even years. That's game over. That's hundreds of millions of people in a desert with no drinking water. That's probably the entire Arabian peninsular in a state of collapse... who are then all immediately furious with the USA and Israel, and have nothing left to lose. Also, while they may be able to force some of their slave labor Indians to work in radioactive refineries, you're removing most of the supply from the global economy for quite some time - it'd make 2008 look like child's play.
The very last thing anyone should be doing is sabre-rattling about bombing a nuclear power plant on the Gulf.