It turns out most people _do_ care about privacy. You just have to frame it in relatable terms.
I don't want anyone else watching me take a dump because that's private, and it's not any of their business. Likewise, I don't want other people knowing what articles I read on the internet, or what music I listen to, or reading the contents of my business plan, or scoping out my dick pics, or any of a thousand other things, because those things are also private and they aren't anyone else's business unless I choose to share them.
Restrooms have doors, and most people close them for privacy. Data has a privacy door, too, and it's called encryption.