This seems like entirely normal human behavior at every level of society, no? Of course asking Zuckerberg is a bit like asking a bartender, but we know very well that it's not only bartenders who'd be against stopping alcohol sales.
It is strange to condemn Zuckerberg for doing this unless you're also willing to implement the all the other (vastly more important) advice from wellbeing experts that we as a society have pretty decisively rejected.