Subway and train systems are fundamentally different modes of transit than bus systems. They are more accessible, run on regular schedules, and they are anonymous.
The urban poor in other cities utilize them disproportionately which is why Beverly Hills shuts down every hint of a conversation of adding public transit connection beyond commuter buses.
It's too bad if you're offended by what I said, but LA has more nimby's per capita than anywhere I have lived which is exactly why we do not have a public transportation system.