why should anyone care about privacy? Privacy is important because it prevents bad actors from learning about you. If a bad actor can learn about you, they can anticipate your actions and beliefs, and uses things in coordination to influence your behavior without your awareness.
I think that digital surveillance is in part responsible for the polarization we see in our society. When people know that they are being watched, or that their events are being broadcast to a wide audience, they may act in ways that are easier to define. Instead of being a moderate who agrees with Democrats on some issues but Republicans on some other issues, the persona they broadcast online encourages some more pure, more extreme beliefs.