I don't think that's true. People clearly care about privacy otherwise we wouldn't have curtains and account access controls etc.

They just aren't worried enough about Facebook violating their privacy enough to stop using it. Frankly for most people that is the right decision. Facebook has done much less immoral stuff than the media would have you believe. Even the Cambridge Analytica type stuff (i.e. the obvious potential for abuse of the Friends API) was totally public at the time but nobody cared.