Full Idea
We accept, indeed regard as a platitude, an idea that Aristotle rejected, that someone can have one virtue while lacking others.
Gist of Idea
Nowadays we (unlike Aristotle) seem agreed that someone can have one virtue but lack others
Source
comment on Aristotle (Nicomachean Ethics [c.334 BCE]) by Bernard Williams - Ethics and the Limits of Philosophy Ch.3
Book Reference
Williams,Bernard: 'Ethics and the Limits of Philosophy' [Fontana 1985], p.36
A Reaction
Probably because we don't think as hard about it as Aristotle did. What are the prerequisites of even a single virtue? Distinguish a true virtue from an accidental good quality.