Even taking into account that child abuse is as bad as child abuse is, blacklisting child abuse pictures at the ISP level is unnecessary and counter-productive:

Even taking into account that child abuse is as bad as child abuse is, blacklisting child abuse pictures at the ISP level is unnecessary and counter-productive: - Experiments by civil rights activists have demonstrated that it usually only takes hours to take down a child abuse website if one alerts the hosting company. - Owners of a child abuse website (if they haven't gone peer-to-peer yet) can check by polling their own website's availability whether they're on the federal police's radar yet. - The blacklists themselves can be considered a "best of" of child abuse picture websites; since they need to be distributed to hundreds of ISPs, their eventual leaking seems inevitable.