Two intersecting sets: (a) trustworthy people; and (b) skilled programmers. Both difficult to observe. Having good information on at least one set is a definite advantage, both for screening and for avoidance of sub-optimal candidates. One would need to make assumptions about the relative trustworthiness of the candidate pools to decide which is more beneficial. It may be that in certain areas, at certain times, its rarer and more difficult to assess character than competence (the latter even at high levels).