I would absolutely give you a break if you don't join the Peace Corps. I won't give you a break if you choose to take a lucrative job at Facebook. This is not a black-and-white issue.

>I will agree that Facebook's controversies are a bit more egregious than most

So, I would posit that working at Facebook is, thus, "more egregious than most" other jobs. That's the point here. Nobody is saying that it's either work at Facebook or join the Peace Corps. I, personally, think an engineer at Facebook is contributing more harm to society than an engineer at any of the other companies you mentioned, yes. Substantially worse? Depends how we define that. But, worse? Definitely.