I'm sure this is true, but that's not the point. Lots of people chose to do wrong things due to the belief in their mission.
The Russians believe they're doing the right thing in Ukraine right now, does that justify their actions, the death and destruction? People always believe they're doing the right thing, whether or not it's actually true. Corporations just make it really easy to convince yourself that what you're doing has a positive impact because they have entire teams of people whose job it is to create that messaging.
We all have the capacity to lie to ourselves, and I'm sure getting treated like a "rockstar" helps to avoid reality, as the author points out.
If you still wonder why people work at Facebook, here's your answer. They, like so many others out there, believe the lies they manufacture themselves to perpetuate this system. They're hooked on their own supply.