Your freedoms are never taken away in a single step. It happens gradually, with you agreeing to every step. It's always "I have nothing to hide", "surely others would protest", "some parents should be monitored", "they wouldn't do that, would they?"...
And all of a sudden your freedoms have been stripped away, without you realising what the state was doing. Unlikely, you say? Ask yourself if you trust your government (not just the current one, mind you) enough to risk it.