I think Nick has nailed it. This is just about preserving the status quo and protecting interests (and has little to do with misreadings of John Rawls). Once again, Zuckerberg decides he has no obligation to the integrity of the information ecosystem- only to the bottom line.
But really this is not the most significant problem. Fake accounts on Facebook continue to proliferate. It costs just $25 to buy 50 fake accounts. There are tens and tens of millions of them- we don't really even know whether these FB numbers are accurate. ft.com/content/984542… 
Along with a crew of folks with better ideas than me, this is the #1 thing we think Facebook should do to protect the integrity of the discourse in the run up to the 2020 election. There are nine more common sense solutions: render.betaworks.com/ten-things-tec…
Yes:
Yes:
