"The only complaints I've seen about it are concerning people responsible for administrating data in companies": now that we're sure some people are annoyed... how many truly benefit from it? I do understand you think it's a good thing. How many in your FB friends share your point of view? How many even know? How many will benefit?
"GDPR represents an ideology": one point we agree on.... "at any human/social cost": what cost? Can't I sue Facebook in a civil court if I suffer any prejudice just like I can sue any company?
Is there any "data-rape": if your data is processed only to choose which ad you will see, does it count as a "data-rape" for you? The ad you're seeing is the only thing of value on Facebook: your data has no value except to show you this ad.
Can you tell me where I can buy data from Facebook? I'd love to buy the friend-list of influencers who have set their privacy settings so that data doesn't leak. What? I can't? Doesn't FB sell people's data? ;-) What about famous artists private pictures then?
That's what people think of when they hear "Facebook is selling your data". They don't hear "Facebook is using your data to show you better ads which pay for the whole service".
Informed consent isn't bad. Have you read FB Terms&Conditions? Have you read the paragraph that says you're OK that FB has the right to use and reproduce the content you're posting on FB? You have already given your informed consent. Now you're trying to take it back.