You&#x27;ll need to be more specific as to the causes of the drop in violent crime in the &#x27;70s.<p>Your example about automobile safety devices makes the dubious assumption that manufacturers wouldn&#x27;t include such technologies if not mandated by the state and that consumers wouldn&#x27;t demand them. You also ignore the ridiculous amount of other required features on modern automobiles that make base models more and more expensive, hurting the lowest income levels.