Earlier quoted context omitted.
Your argument against the ability to wiretap child pornographers and terrorists is "no, sorry". That's not a very complete argument.
His argument is clearly that people have a right to privacy. It says so in his next sentence. The 'no, sorry' is him discarding the emotional plea that often justifies invading a person's privacy in the first place ("please, won't somebody think of the children!").
Except there is no right to engage in total privacy. There is a right against unreasonable search and seizure. But that's hardly a right of total privacy.
Maybe his argument is that he thinks people should have a right to total privacy?