Ugh--this is the article that won't die.
Until pretty recently--just a few years ago--any admission of homosexality or homosexual activity would automatically preclude you from a security clearance. Immediately after 9-11, some Arabic linguists were fired from government service for homosexual activity.
When the Feds expanded the Sky Marshal program in the wake of 9-11, they waived certain minimum standards in order to fill positions with warm bodies--which resulted in them hiring a lot of folks who'd flunked out of Police Academies--often for failing basic marksmanship.
It just goes on and on and on...
Right or wrong, the reason security clearances weren't granted to homosexuals was because of the perceived increased risk of blackmail. If you are from a culture where homosexuality is even less accepted (Arab for example) then this is an even bigger potential problem.
Right--of course, it was circular reasoning--homosexuality was a security risk, because it made you subject to blackmail, because you could lose your job over it.
No, that isn't the point at all. The point is that if you were homosexual, a foreign intelligence agency could discover that and blackmail you to reveal secrets. This doesn't apply so much if you are openly gay vs in the closet but I doubt they made those kinds of distinctions.
Yes--the reason they could blackmail you is because if it were revealed you were homosexual, you would lose your job.
So it is absolutely circular: The only reason you were vulnerable to blackmail was because you could lose your job--because you could be at risk of blackmail because you could lose your job, and so on. It is the very definition of circular reasoning.
You may not want that information revealed for a variety of reasons. Despite the gains in social acceptability of homosexuality, it used to be much worse not that long ago. Many people didn't want their families to know, didn't want it to be public knowledge because it could affect not only current employment but future employment, etc. When determining whether or not you can have a security clearance, they are very sensitive to potential blackmail and if this was something you had been keeping a secret for a long time (before applying for that security clearance) that means it is potential blackmail material. If you were openly gay it shouldn't make any difference because then there would be no blackmail potential but like I said, they likely didn't differentiate and it used to be very common to hide this sort of thing.