Ahmed Teleb makes the wisdom-by-diversity argument against elections and more specifically against first-past-the-post systems:
We’ve all heard of the “wisdom of crowds” especially after James Surowiecki’s 2004 best-selling book by that name and Scott Page’s 2007 “The Difference.” […]
So why does the US Congress, a crowd of 535, seem so remarkably un-wise?
Leaving aside the more entangled issues of independence and decentralization for a moment, the case regarding lack of cognitive diversity is clear.
In the United States, members of both Houses are elected through large, single-member districts based on a first-past-the-post (FPTP) plurality method where the candidate with the most (not usually majority) votes wins. […]
This type of voting mathematically favors a single or dual-party system. It also happens to virtually shut out minority parties and, more importantly, minority opinions. In other words, our electoral system virtually eliminates cognitive diversity–what may be not just a prerequisite for a well-functioning legislature, but the very justification for democracy as a form of government to begin with.