I don't really think it was an easy decision for him this feels like the Bush invade Iraq moment
-It helps the oil lobby and the months before the warning of this announcement the oil prices were going steady up but yesterday it climb fast.
-It increases the conflict in the region and Israel and Saudi Arabia are happy with this announcement also leads to more military contracts and makes the weapon lobby happy. (Good for the ones who have defense stocks aswell).
-Most people don't really understand the deal so it is easy to make it like a good deal for usa to get out. The fact that Iranians were increasingly getting postive views about Americans was annoying for some groups/countries but sometimes it is better that a country not likes you so now just post some burning USA flag picture and you win the masses.
- It helps for a bigger crisis in the middle east and will increase the number of refugees again leading to more refugees to Europe that again will gain right wing voters in Europe who are more inclined to work with Trump so that's also a good thing for him.
In the end this is positive for Trump though.
