Bye-Bye, .xxx

According to the Associated Press, the much-debated .xxx domain for adult sites has been stymied. The Internet Corporation for Assigned Names and Numbers caved to a two-pronged attack from conservatives and porn industry reps. The article says that

Advocates had argued the domain would help the $12 billion online porn industry clean up its act. Those using the domain would have to abide by yet-to-be-written rules designed to bar such trickery as spamming and malicious scripts.

What I'm wanting to know is why conservatives were against this thing at all. I assume it's because they hold out some hope of delegitimizing porn on the Internet, but guess what, folks... it's not going away.

Quite honestly, I'm not sure what to think about this decision. On the one hand, I'm concerned about possible violations of the First Amendment. On the other hand, the .xxx advocates seem to have some good points in the quote above. What do you think?