Why does the ACLU oppose porn filters on library computers?

This article from World New Daily gives some insight.

"A former executive for the American Civil Liberties Union of Virginia has been sentenced to eight years in prison after he admitted having "graphic and violent" child pornography.
Rust-Tierney previously had served as the president of the Virginia chapter of the ACLU, and admitted his guilt under a plea bargain.
It was Rust-Tierney who, nearly 10 years ago, had argued before the Loudoun County Library Board against any Internet filters on the computers at the public facility.
The library, which had been using filters on its computers, was ordered to change its policy by a federal court.
"The ACLU of Virginia urges the board to carefully consider a new Internet Use Policy that allows for maximum Internet access…," he said at the time.
He encouraged the library board to recognize "that individuals will continue to behave responsibly and appropriately while in the library," so therefore "the default should be maximum, unrestricted access to ... the Internet."

Is anyone out there suprised?
HT Spirit Daily