On BART safety concerns and union contracts restrict automation. This fun article from 2017 [1] could have been written today but shows why it's so hard for public infrastructure to be effective. Every actor is incentivized to get something out of public infrastructure. In the current AI mood I suspect opposition to automation by unions would be even stronger.

The Abundance movement has put a good moniker to this concept: Everything Bagel Liberalism.

[1]: https://sf.streetsblog.org/2017/03/06/lets-talk-seriously-ab...