lol, that's not colonialism.

  Colonialism: the policy or practice of acquiring full or partial political control over another country, occupying it with settlers, and exploiting it economically.

However, with that in mind, I'm alluding to the kinds of people in a city like San Francisco. The older, rich, land-owning class tends to be very activist and tends to vote. The younger, less-wealthy, renter class tends not to vote. Therefore, the needs of the few are outcompeted by the needs of the many.