Arrington is completely inconsistent when it comes to the right to free speech. For instance, when it comes to another unsavory free-speech issue, Holocaust denial, he writes:

"Sure, we can’t shut down the dark places on the Internet where people are free to hate Jews [...] But Facebook can take a stand and say it won’t happen in their back yard. Holocaust denial is hate speech, and it cannot be given a place to take root." (from http://techcrunch.com/2009/05/12/facebook-remains-stubbornly...)

He could just as easily swap out prostitution for Holocaust denial and Craigslist for Facebook, and make the exact same argument, no? After all, I'm pretty sure sex traffickers are doing more damage to society today than a handful of anti-semitic cranks.