SwedishK The OP wasn't talking about the people living in the countryside who does need cars like these. She was talking about city-SUV's.
Plenty of people live in the countryside and drive into urban areas for work. And why should people who can't afford to live in the countryside be denied 4 x 4s? I use mine as a camper-car with all the rear seats folded down to make a sleeping area. I know, not popular in this country but it is elsewhere. Saves me loads of money, means I've been able to go on trips and socially distance when it was allowed during the pandemic.
Also, nobody has said we should get small cars and throw them away after 5 years. Not sure why you would think anyone thinks that's a good idea.
But small cars do tend to have a shorter lifespan than luxury 4 x 4s. I have a 21 year old Mercedes M class (see above) that might well keep going for another 10 years, if not more. Thats much more environmentally friendly than 2 small cars which only last 10 or 12 years (or even less) each.
People also need to get out of their cars full stop in cities and cycle, walk or take public transport more. The government needs to stop building massive new housing estates on the edge of villages with no paths or bike routes to link them to faciities, and to stop building out of town retail parks that people drive to and instead encourage smaller local supermarkets and mixed shopping hubs. As in The Netherlands. Its just that theres more profit for government and local authority cronies in not getting planning right.