First: In the real world, this has led to a pathology where the tech sector maximizes its own comfort. You don't have to go far to see this. Hop on BART after the conference and take a look at Oakland, or take a stroll through downtown San Francisco...
Second: Techies will complain that trivial problems of life in the Bay Area are hard because they involve politics. But they should involve politics.
So first he's criticizing techies for not fixing the pathologies of Oakland. Then he's saying these problems are rightly the domain of politics. So what's the problem? Those are political problems, should be left to politicians, and techies are doing exactly that.
Finally: In a world where everyone uses computers and software, we need to exercise democratic control over that software.
Aha - so first techies are not solving problems that the author thinks they should be leaving to politicians. From this he draws the conclusion that techies - currently doing a great job of solving the problems within their domain - should bow down and submit to control by the politicians who failed to solve the local problems he cares about.
Another choice line: If after decades we can't improve quality of life in places where the tech élite actually lives, why would we possibly make life better anywhere else?
Why would we do something that benefits far away humans over something that benefits nearby humans? Don't help those foreigners (or people in NY)! Build a wall! Trump 2016! (Same idea, just directed at a slightly different target.)