Amsterdam has ~1.5m people in the metro area while LA has ~18m (more than The Netherlands in total!). They're just not comparable in terms of infrastructure. LA is also growing very rapidly (it's added 2 Amsterdam's worth of people since just 1990!) which makes it difficult to properly plan infrastructure.
They are not directly comparable, but not for the reason you state. Thing is, mass transit scale a heck of a lot better than highways do when population rises.
You're right they are not comparable in infrastructure, there are no dedicated bike lanes forming a connected network, but there are surely lots of dead pedestrians and car carnage.
