They are community members just not the ones who share your point of view. Those community members who might share your point of view don't show up.
I've never seen community members fight for density either. We want to tear down our housing so large buildings blocking the sky can be built by corporate landowners. You know who owns large buildings? Corporate landowners. The people with little houses are average citizens.
Public transit doesn't need density. Public transit exists in places with little density.