Great question, and I personally believe it's driven by modern American communities being unable to maintain their own infrastructure at any level. 100 years ago people worked for a living, with their hands, and would often have to build, install, and repair their homes, roads, and other infrastructure themselves. They understood the process, and what it takes to get something done.
These days, most households, especially the wealthy ones like in Marin, are helmed by people who do NOT work with their hands, do not respect people who do, and who have no interest in learning more. Even worse, infrastructure work is so heavily regulated and specialized that gobs of accidental complexity prevent anyone who wanted to from learning more about it, reinforcing the ignorance.
And truly, it's easy to have sympathy. The world is a complex place, and no doubt they have their hands full dealing with the technology revolution and palace intrigues at work; who has time to understand something as boring as infrastructure? And besides, if infrastructure fails, it fails for everyone so there's no real benefit to being informed or prepared (in that sense being informed about city infrastructure would be very similar to being a "prepper", in a weaker sense, which comes with it's own stigma).
So if you say "That's ridiculous, be quiet" you will offend sensibilities to the extent YOU will be banned, banned for having dirty knowledge, for shaming those that don't, and for tacitly asserting the value of having such knowledge! Plus, your views aren't in their news-feeds, so there's no emotional juice to them. Emotionally driven opposition is the inevitable retarding force in the hyper-connected, capitalist info-sphere, and ultimately leads to civic ignorance and paralysis. Good luck overcoming that in your city council meetings! (But you have my respect if you even try.)