The countries that need a whitewash are the ones that have really bad human rights abuse (or, in this case, a country that let tens of thousands of people die building the very same stadiums that are being used). That's not related to being white in any systematic way

Why would a country build stadiums to whitewash the deaths of labours during the construction of stadiums?

It is the same system British designed to control colonies: carrot and stick, weaken them, make sure they are dependent on you, and then you control it. Would west boycott energy from the middle east? Almost all resources in middle east are controlled by western companies one way or another. The media and government play different roles to serve the same purpose, to control the world.