Forcing everyone to build parking makes building more expensive (http://www.thestranger.com/news/feature/2015/07/29/22612207/...) and spread out (google "parking crater" for examples, e.g., http://www.gcpvd.org/wp-content/uploads/2012/04/parking-cris...) which makes it harder to walk, bike, and take public transportation, which causes more people to drive, which causes more need for parking.

Parking your car costs money. People should pay to use it if they need it, but the rest of us shouldn't have to. Right now, drivers are subsidized.