A few of my school friends moved out there (and Abu Dhabi), they see it as a sort of dream land where they can live a luxurious life they believe they thoroughly deserve and earned. They're a mixture of disbelieving there's some gross stuff going on and dismissive of its severity. An argument I've seen by one was that there are no countries that can escape criticism, which is true in a way but it just feels a bit more cruel and deliberate in the Gulf.
So that explains a little bit of the indifference to the defacto slavery, however these sort of stories where the person suffering is white may give them pause for thought...