Racists and antisemites should NOT be able to obtain security clearances. When I was a gov employee, I had a polygraph for my TS/SCI clearance renewal. Questions on racism and antisemitism were not asked - this is a security risk.
@Bix And it's a far bigger risk today than it was, say, 30, 20 or even 10 years ago, bc these people *know* it's wrong, and they'll do anything to avoid being caught.