Instead, let's do some white hat thinking (purely facts, as little spin as possible) about Zuck's new venture. Fact: Zuck has laid down a large chunk of change for a new project, and marketed this project to the public as large scale philanthropy. Fact: Zuck will get a large amount of leeway on taxes and oversight by moving his money in this way. Fact: some billionaires before Zuck have made similar moves that actually turned into fantastic philanthropic organizations that have made tangible positive impact in the world (Gates Foundation)-- but others have used the construct as purely a means to protect their money and get good PR.
These are some of the facts. I do not believe that there is any way to get around or reinterpret any of them without adding opinion, which probably snuck in anyway despite my efforts. At this point, I think that the reactions of those who question Zuck's motives are justified because we haven't had the time to see the program in action disbursing money as it claims that it will. A promise, a wad of cash, and a lot of PR do not make an effective philanthropic organization. Effective philanthropy requires that real, living people and real institutions are altered in an objectively positive way. The proper stance is skepticism and a request for more evidence of good will.
EDIT: I will add that the rabid detractors of Zuck have counterparts with the rabid pro-Zuck crowd... I doubt Zuck is looking out for anyone other than himself, but there is more to life than celebrity-watching, and it seems petty no matter how you slice it.