That's not my logic at all. The GP asked what this has to do with Google. I'm saying there are clearly scenarios where Google has a responsibility to limit access to content, even content they don't provide. In my opinion, it is not tenable to say "let the courts go after the child pornographers, but Google shouldn't be asked to block access to their content".

And notably, I'm not even arguing that Google should ever be ordered to block sites worldwide. The GP's argument has NOTHING to do with the worldwide nature, on the contrary, that it is worldwide was only parenthetical in the comment. The same argument would stand even if the decision only affected Canada. It argues against involving Google at all, and that's what I'm debating.