Petroleum is used for far more than just vehicles. Cheaper petroleum should benefit many, many industries. Industries that should be cheering cheap oil: automotive, aviation, trucking, plastics, detergents, heating oil, synthetic rubber (tires), synthetic fibers (clothing), fertilizers, food additives, cosmetics, medicine, etc. Yes. Some Americans will lose jobs over this, but cheap energy should literally fuel a stronger economy.
I understand the manifold purposes of petroleum, but understand that extremely cheap oil does not mean a strong economy. Americans benefit if/when we’re pulling that oil from the ground. That keeps drillers and engineers employed, truckers on the road, and money stays onshore. As the price of oil craters, it becomes cost prohibitive to pull the oil out of the ground domestically, thus all of those drillers, engineers, and truckers lose their jobs.
I think the magic number was ~$50 per barrel. Under that, oil exploration and extraction is not just unprofitable but an accounting liability.