I believe the UAE and Kuwait have the highest income per person in the world. Terrorism will never have significant influence in a capitalist society.
The "highest income per person in the world" is not because they are a capitalistic society or capitalistic individuals like PrinceOfCups implies. For nearly all of them them their wealth is more like winning the lottery, wealth won by chance through no calitalistic effort on their part at all.
I know that there are aspects of these societies that are socialistic, but that is true of every economy that I know of. There are also sectors that are preindustrial nomadic. However, Americans can collaborate with those who want to be capitalists and build a modern society and we have in Saudi Arabia. They have money and we show how to turn that into profitable business. That is what capitalism is.