People shouldn't be eliminated because of the group they belong to.
People of any background should be able to take the aptitude test for a job.
If people have excelled at it, then they should not be eliminated against someone who did ok at it.
However - this is different to the issues raised by Trump.
It seems from what people are saying is that there are people in ATC who may have passed the aptitude tests to be an ATC but who didn't do as well as some other people - but these people who excelled didn't get the chance to be an ATC. Or they weren't even able to take the test - or a test was designed so they would not pass.
But the people who did get through have passed an aptitude test and presumably they under took training, exams etc to qualify as an Air Traffic Controller.
They may not have been the best. People who could have been better may well not have even had the opportunity.
BUT they still proved they could do the job. Because as people have said, ATC is a safety critical role so you want people who have proved they can do the job.
Unless people think that the training and the exams etc is not good enough and the people who have qualified are unable to do the job?
Because if that's what people are thinking, then think about all the other safety critical roles there are where people might not be the best but they have proved they can do the job to the expected standards.
Pilots, surgeons, doctors. All people who may not be the best but who have proved to others that they are capable of doing the job to the standards expected.