LA has and has long had fewer cars per household than the national average (1.6 vs. 1.8 in the latest census). 12% of households have no car.
2. I'm not sure what census blocks you are including in your definition?
For a very long time, LA was also very famously anti-pedestrian, both in laws and enforcement. It's trying to change for sure, but I would not say it's there yet.