It is fine that there being different types of cars meaning there must be more competition and more jobs available and therefore helping the economy. Although I do agree that they should all be trying to make their cars more safer for the planet and for people, there should be wide variety available to choose from because people love their cars.
There should be many types of cars becasue people want lots of choices. Some are expensive, some cheap, old people want cheap cars and rich people want expensive cars.
Some cars are big and some are small. Some people have big families, and some have small, so they want big or small cars.