To what end would you say the surveillance is for?
So you surveil your citizens and precog their opinions... to do what? Make them have state-sponsored opinions? Don't we already have that without the surveillance?
It's trivial to predict how a human will behave without any surveillance at all. Facebook abandoned their Beacon system not because of the backlash, but because they realized all they really needed to predict user behavior was the user's credit card statements, which they could easily buy.
At some point the constitution is the backstop, and unless we amend it, it should hold true.
I don't think that the EU member states have the same data access as companies in the US like Facebook do, and therein lies the problem. There is no good way to gather and connect data like Meta or Palantir can, you can't just sell things to the maximum bidder here. I think that's where the necessity comes from.