1) The core product is good and useful to people/society
2) Most of the negative articles about Facebook are based on some piece of truth but go out of their way to make things seem worse and more sinister than they really are
3) Zuck generally wants to do the right thing, but of course makes mistakes
4) Yes the company does bad things sometimes, but not significantly worse than Google or Amazon (which are the main places many FB employees would consider working if they left)