I wouldn't say it's the most pressing privacy issue, but we can collectively focus on more than just a single priority. For instance, I wouldn't call someone's medical career useless just because they weren't working on reducing heart disease.

For a long time the first Google result for me was someone from my school posting about work I did. I didn't find their comments particularly complimentary. I wasn't wild about the idea that someone at a prospective employer would probably Google me and see that. I didn't like the idea of harassing the site owner into taking it down, but I will say a big motivator for me in open-source has been flooding the Internet with better reflections of myself to drown out stuff like that. Stuff ends up on the Internet without people's knowledge or express consent all the time. When I joined LinkedIn they already knew a bunch of people I could be connected to. I never gave them that info about my relationships. Other people did! First thing I got was a suggestion to connect with my ex-girlfriend. I hardly think I'm an anomaly with stuff like this.

edit: As another datapoint, I have a coworker who is fanatical about privacy. Will refuse to stand in group photos. Will ask you to delete photos they may appear in if they see you taking one. Gives random names on restaurant orders. No LinkedIn, no social media. I Googled their name: tons of accurate photos, an accurate phone number, school history, etc.