Several years ago in Stockholm (2014) during a conference focus on the Internet, the Chief Technology Officer for Barack Obama's 2012 re-election campaign held a talk on how they revolutionary the campaign process by using targeted advertisement campaign on social networks, mostly Facebook, and how effective the technique was to reach voters during fund raising and getting their voters to vote. In their view, this was the first major use of social media during an election. The talk is still available on Youtube for those interested. (https://www.youtube.com/watch?v=G3WS9bs3Aps)

There are also articles from 2011 where political commenters noted how the Obama campaign broke new ground using targeted Facebook advertisement and outreach, and how EU politicians could learn from it. The many smaller, but in total larger donations given to Obama was contrasted with Hillary Clinton who had larger individual donations but less in total, and the commenters attributed this to the use of Facebook and finding and meeting a younger audience on those online platforms.

People thought that targeted advertisement was a good thing and politicians looked on the techniques from that election and saw the potential for power. It was mostly just those privacy advocates, free software advocates and security experts that expressed doubt and warned about the dangers.

"We also as individuals [without billions] have fairly limited capacity to directly act against these things. I donate a fair bit to the EFF for instance and I've sent outreach to representatives multiple times over the years for specific bills and when its possible I vote against surveillance." - from a parallel thread I was commenting in.

I'm totally fine stopping at minimizing my culpability. I sleep just fine at night and don't really jump at purity tests like you seem to want. I'm not other people's savior and I don't want to be. If you want to put your energy into that, I support you.