Assuming we’re talking about the contemporary conception of virtue as ethical behavior (as opposed to the latin virtus, which is closer to what we’d refer to today valor or courage) are they correct?
The GSS includes three questions serving as reasonable first approximations of the contemporary concept of virtue. The following graph shows how respondents, by intelligence buckets as measured through Wordsum scores, fare on these measures. To avoid language fluency issues, only those born outside the US are excluded. To avoid racial confounding, only non-Hispanic whites are included:
No apparent relationship emerges. Each intelligence grouping looks best on one measure, worst on another, and in between on a third. The differences are modest.
Intelligence is as useful for rationalizing as it is for ratiocination.
GSS variables used: EVSTRAY(1-2), ARREST, TAXCHEAT(1-2), WORDSUM(0-5)(6-7)(8-10), ETHNIC(8,10,11,14,15,18,19,21,24,26), RACECEN1(1), HISPANIC(1), BORN(1)