I think Mark has a hidden agenda, and it will be sometime before we all figure it out. As for my personal opinion, I do not trust him, and I am deeply suspicious of everything he says and does.
I too read his lines and watch his moves closely, because he has the potential to affect things substantially towards things that go against my own agenda, not because of some universal distrust of people in high places. A little distrust is healthy, but to do so unconditionally risks forcing people like Mark or anyone for that matter becoming the monster you fear they can be.
Either he has changed in massive massive ways to the point he genuinely has love for middle America and can relate to them or (more likely) there is a big dissonance between the persona he is putting on and the real Zuck