I very much doubt that most employees at Facebook share your viewpoint that Facebook is a net negative for society. It’s almost a tautology—people who feel that way won’t seek employment there.
Some employees probably feel that they can help move things in a better direction.
surely then there ought to be nobody who willingly works at a tobacco company!
Yes, and I’m hoping that these “scandals” make people reevaluate their previously held beliefs.