They have done this because big trucks are by far the most profitable segment of vehicle, and emissions regulations reward vehicles for being large.
If the massive cars cost what they should, people wouldn't buy them as much.
Not everyone thinks like you. Some people like trucks so they buy em
Pickup trucks are popular in the US and the Americas broadly where they are heavily marketed. Pickup trucks are less popular in places where they are not marketed as heavily. Even outside the auto industry, there is a general consensus that marketing works. Make of that observation what you will.