The better rational counter argument is that "privacy is a human right enshrined in international law". Society has zero business knowing anyone's private communications, whether or not that person is a terrorist. There is nothing natural about being unable to talk to people privately without your speech being recorded for millions of people to view forever. Moreover, giving society absolute access to private communications is a short road to absolute dystopia as government uses it to completely wipe out all dissent, execute all the Jews or whatever arbitrary enemy of the state they decide on, etc.
You do not get to dispense with human rights because terrorists use them too. Terrorists use knives, cars, computers, phones, clothes... where will we be if we take away everything because we have a vested interested in denying anything a terrorist might take advantage of?
You do not get to dispense with human rights because terrorists use them too. Terrorists use knives, cars, computers, phones, clothes... where will we be if we take away everything because we have a vested interested in denying anything a terrorist might take advantage of?