Most people don't need a truck, maybe, but the three top-selling vehicles in the US are trucks. And in 2017 only 35% bought cars, with the rest being trucks and SUVs.
USA is very sparsely populated (35 people per square km, 174th in the world), most of the people live in countries with more than 100 people per square km.
To be exact 67% of people live in such countries, and 83% of people live in countries more dense than US.
