I'd say you're making the assumption that it will be used for good, when so many charities are indeed used for tax evasion (and other more nefarious purposes).

I'd say you're making the assumption that it will be used for good, when so many charities are indeed used for tax evasion (and other more nefarious purposes). When you condition these probabilities on how most charities actually operate, and on Zuckerberg's past behaviour, a high level of cynicism proves to be the rational position.