This is what the great country of the USA is. We, the people, have choices and that's great. If you don't live in America it is hard to understand (I know you said you moved here few months ago but still). Yes, transport 5-6 people in a 3 ton vehicle or driving pickup trucks to get grocery is such a waste. The same can be said for 2 people living a 5000 sq ft home with 8-cars garage. If you CAN afford it then Why not.
This is Do-able but would you turn down the option to travel the country in a $100k Slades, Navigator, GLS, or LX600? I doubt that. The point is - it is GREAT to have options and the freedom to choose it