I think that part of the article was really the only thing that resonated with me, as a SF resident.

Note that "sincerity" in this case doesn't necessarily mean positive things. There are lots of people here with a sincere belief that their startup will change the world, but for some (many?), either their mission is actually a pretty bad one, or the path they take in service of their mission ends up being -- at best -- borderline unethical.

That doesn't make them insincere, though.