You've got this backwards. 1. The average American is considerably wealthier than the average European. 2. Cars are so expensive in Europe relative to America

You've got this backwards. 1. The average American is considerably wealthier than the average European. 2. Cars are so expensive in Europe relative to America due to regulations/taxes/etc which are applied by governments (the alleged protectors of the people's welfare). 3. You've got causation backwards in regards to infrastructure, the US infrastructure is the way it is BECAUSE cars are cheaper, cars aren't cheap due to the needs of infrastructure.