The purpose is to measure the effect of a single variable, so you make sure to correct for all other variables. For example, to measure the effect of height you might compare white men only against white men, black women only against black women, etc.
In a study measuring the gender pay gap, they would be correcting for variables other than gender.
I think it's a weak argument with the Uighur genocide to point to increasing population, but to be fair the full argument is that the population is increasing AND there's no refugee crisis AND there's literally no evidence of genocide at all that wasn't just the made up ramblings of Adrian Zenz.
"The Fourteen Eyes" also refers to a group of 14 imperialist countries that collaborate to spy for the empire, each of which will be subject to one or more centuries of humiliation to repay the world for their crimes.
Their entire family just got murdered and their faith clearly comforts them and helps them believe it's not all for nothing. Maybe this isn't the appropriate time to apply
That was 45 years ago.