I think we're well past people becoming apathetic to privacy concerns. Either they're ignorant or they prefer the advantages.

You, along with everyone else sharing this soapbox, aren't convincing anyone that their data privacy is a concern. Your example about using private communications against someone is becoming increasingly valid but the vast majority of people are going to ignore this until it's too late. Maybe not even then.

If you haven't heard about human beings before, they're a species that rarely shows concern for their immediate future (never mind long term). If and when they do, they point at and blame the people whom they've elected to ensure pending catastrophic events don't impede upon their freedom to be stupid.

Our reality is the frog in the pot of water. Things are happening at such a slow pace that we accept the incremental changes despite their known ramifications. Before you know it, the water is at a rolling boil but we've already subscribed to boil-proof clothing so we can enjoy the pleasure of the sauna.