'What in the world are people putting up on Facebook that is so important?'
Facepalm! The stolen tokens also allow attackers access to 3rd-Party accounts (see below). So there's a major security issue here alongside all the privacy aspects. Some users will have leaked posts or embarrassing or comprising pics etc that were hidden, but can now be used for full-on extortion.
So this is a huge issue, far bigger than the political interference angle of Cambridge-Analytica/Palantir etc. And you've just shown you're part of the whole problem because you don't get it, or are just underestimating it... Anyone in your circle you've given advice to, seriously needs to do their own research!
"Facebook has confirmed to reporters that the breach would allow hackers to log in to other accounts that use Facebook's system, of which there are many. This means other major sites, such as AirBnB and Tinder, may also be affected."