For some reason, freerepublic has pulled some of my threads when that contained links.
I am not in a position to speak for FreeRepublic or for JimRob but I think I can offer an educated guess.
First, linking to pedophile sites *might* be construed as participation in their activities. That's something we certainly wouldn't even want an unwarranted appearance of.
Second, sometimes a hot link to a questionable site can cause the whole of FR to be flagged by search engines as unsafe. This has happened in the past, where a poster unknowingly linked to such a site and suddenly everyone attempting to log on to FR was either denied access or given serious warning messages from their browser/search engine.
Pinging JimRob so he can correct me if I'm in error about this.