There have been plenty of toxic people i've worked with who seem to think their job is to "point out all the unfairness in the world", when really they're just hired to pull stories off a backlog and write code.

I get that there are good whistle blowers. I also have first hand experience (a growing list recently) of people who decide to vilify their coworkers under the guise of "justice" and "taking down the man" when really most people ("evil VPs" included) are just trying to do their best and get through the day. They on the other hand are horrible to work with, and usually very unproductive. When threatened with performance management for their lack of delivery, they then tend to become hostile and see the whole charade as a conspiracy against them, when really no one trusts them or wants to work with them as they are assholes.

To be clear, the employee in question believes Facebook is giving preferential treatment to conservative-leaning pages. I'm not sure if that alone makes it fair to call them a left-wing activist, but this isn't an example of left-wing privilege either.