Earlier quoted context omitted.
It's also full of inaccuracies. The "interesting details" are largely wrong. Unfortunately it's written in an authoratative style, so people assume it's true and upvote, demonstrating one of the major flaws in vote based systems.
Agreed re voting systems. I believe that a good Q&A site should use "voting" to recursively find smart people who are similar to you and can provide you with good answers....as opposed to showing the most popular/well-written/pithiest answer. "PeopleRank", maybe.
The problem is preventing this leading a site dominated by a group of people who share a set of extreme opinions of one sort or another. There's no now site where you can't get karma for reinforcing some commonly held group opinion and if Karma became self-reinforcing, the problem would get harder.
It might not be impossible - maybe you could have secret algorithm for rewarding people only for making well-respected non-polarizing posts. But it would be quite tricky.