There are only a few places in the Bay Area as dense as the European and Japanese cities that have mass transit. I've been to a number of cities in Europe and

There are only a few places in the Bay Area as dense as the European and Japanese cities that have mass transit. I've been to a number of cities in Europe and Japan with the population density of the Bay Area. They don't have subways. They have a couple of train stations that link them to major cities. Most people who live in these places drive cars, ride bicycles, or take the bus. The kind of public transit you want is only sustainable in very dense cities. Outside of downtown San Francisco and Oakland, the Bay Area is a suburb. The amount of money it would take to subsidize a reasonable subway system would bankrupt the state.