I believe they crush technologies, but most of the things you mentioned aren’t true. There were no spaceships possible in the 1930s. Why crush that technology when they could have conquered the world with it? It’s not possible to run cars on water. The thermodynamics just doesn’t make sense. We have cars that run on biofuel, but mass-converting vehicles to that would drive up costs of food. Ethanol for fuel already does that by using farmland that could grow food.