I really should have rtfa, but there is a difference between mass surveillance and targeted surveillance.
The old school surveillance was targeted, because it just didnt make sense to waste all that manpower. Now that its cheaper to do mass-surveillance.
As a society we have to accept target surveillance (unfortunetly), but software cant be back-doored with any guarantee that it will be only used in targeted surveillance.
Mass surveillance will always be immoral, because its punishing the innocent to try and protect them from the guilty. Principles like that are very human, they dont change with technology.