You can think of it in terms of simpler concept: "giving people free stuff causes more people to take free stuff".
Cars and infrastructure for them is heavily subsidized so building more if it (giving free stuff away) induces more people to use it.
As car infrastructure has a cost which car drivers don't cover building more if it is very expensive for everyone else that's why we shouldn't want more if it.
Cars and infrastructure for them is heavily subsidized so building more if it (giving free stuff away) induces more people to use it.
As car infrastructure has a cost which car drivers don't cover building more if it is very expensive for everyone else that's why we shouldn't want more if it.