It is the courts' job to block unconstitutional or otherwise illegal laws.

I believe someone said in a previous thread that a court in an EU member state had already found this mass surveillance on citizens who are not criminal suspects to be illegal under either their constitution or the Charter of Fundamental Rights, but I can't find it anymore. I am wondering why that is not sufficient to permanently block this.

Edit: This is not to say that you shouldn't resist the laws at every other level, too, because you definitely should.

It's the circuit breakers job to prevent a faulty appliance from burning the house down yet I'm glad that appliances include their own fault protection.

I believe it was Germany's constitutional court, which given the experience of East Germany is understandable.