Why are so many privacy promoting people posting their personal data online?

SYST3M_D3STR0YER:

I was just heavily under the assumption that no one really intends everyone to see your face online (which was the key flaw for this question) because it can be so drastically abused

Sure, that is understandable, but an individual’s mission may benefit from public exposure despite the various risks involved with following through with it. For example, the people involved with the Tor Project exercise privacy of their public identity to various degrees:

torproject.org

The Tor Project | Privacy & Freedom Online

Defend yourself against tracking and surveillance. Circumvent censorship.

In addition, what can be drastically abused in theory does not necessarily equate to actively being drastically abused in practice.