RE: Should ISP block child pornography?

They put IP of some government or critical (for example, VISA/Mastercard processing) sites in their blocked domain - and those victim sites will be blocked. This trolling is very popular in Russia, for example.

This should be very popular everywhere in the free world -- explaining why it is popular in Russia but not in non-free countries such as the United States of America ... --- The fact that there's a Highway to Hell but only a Stairway to Heaven says a lot about anticipated traffic volume.