Because there are two cities: One of the ultra-rich and one for every one else. If you take your Maserati or Model X from your garage to an underground parking lot with a security guard, you don't care that there are thefts happening on the streets. Similar reasoning applies for every other issue people complain about. Don't like open-air markets for selling stolen goods in the Mission District? Simply don't go there. Out of sight, out of mind.