Everybody in this entire debate is just talking past each other.
On the pro-government side, the position is something like "We have such a thing as a lawful search warrant, and if you get one you have to comply."
Meanwhile on the crypto-anarchist side, the position is something like "We can design a crypto-system that is indifferent to your lawful warrants."
But these are really two different arguments, that proceed as follows: the anarchists say "Because X is possible, therefore it should be legal", meanwhile the pro-governmentals say "Because X is required by law, therefore people should do it." But neither of these necessarily follow.
On the pro-government side, the position is something like "We have such a thing as a lawful search warrant, and if you get one you have to comply."
Meanwhile on the crypto-anarchist side, the position is something like "We can design a crypto-system that is indifferent to your lawful warrants."
But these are really two different arguments, that proceed as follows: the anarchists say "Because X is possible, therefore it should be legal", meanwhile the pro-governmentals say "Because X is required by law, therefore people should do it." But neither of these necessarily follow.