[ZanyProgrammer]

Even BART elevators (at least in the urban core) are nasty and practically toilets. Just try taking the elevator at Oakland Coliseum or Civic Center. There needs to be strict policing of public accommodations (and I use the term policing in a generic sense), but the political will to do so isn't here in the Bay Area. Just look at the freakout over homeless people squatting in the downtown BART stations.