David Douthitt over at Unix Administratosphere offers a well thought out and rational criticism of "Site Filtering By DNS" ... for a geek. However, the small town librarian Ms Marple is being pressured (back in the stacks) by Rev. Harrumph to protect those sweat innocent library patrons from such filth and degradation. On a shoe string budget. With no technical support. While trying to fend of Rev's advances.
Well-meaners and do-gooders, in keeping with the current aire of righteousness, simply have to protect little Jimmy and Susan from the scourge of the Internet. By the force of LAW no public entity will knowingly allow our innocents to be at risk of ... exposure. Well, at least not at the library.
The same Meaners and Gooders would repeal the Law of Gravity believing that in doing so they might prevent lil' Jim and his squeeze Suez from falling off their bicycles.
Full reference link: Why Site Filtering By DNS Fails