It seems pretty straightforward. The TSA doesn't focus on competence when hiring, resulting in a less competent workforce. They have an entire department dedicated to prioritizing characteristics unrelated to competence, such as skin color, sex, etc.: https://www.tsa.gov/civil-rights-diversity-and-inclusion.
This is not the case of most countries and in fact, it's illegal in many places to do so.
It does to me. The goal of achieving a workforce that is phenotypically representative of larger society (a goal of that department) is incompatible with the one of achieving a competent workforce. If the goals were compatible, there would be no need for such a department as it would just occur naturally through hiring the most competent workforce. The department exists because hiring the most competent workforce does not result in a workforce that is phenotypically representative of larger society.
This is not the case of most countries and in fact, it's illegal in many places to do so.