Of course there are bad drivers in all sorts of vehicles. Just as there are snobs, inverse snobs, selfish people, jealous people, everything , in all sorts of vehicles.
Fugly cars come across the whole price range : I drive an officially fugly car because of it 's qualities suit me, there are cheaper cars that are much better looking , and more expensive (very expensive) cars that I find really ugly too.
But for me, the issue of size is that however well or courteously parked or manoeuvred massive 4x4s simply take up more space. My Mum lives in a picturesque village popular for cottage rental. The introduction of big wide cars as standard in the cottage-renting and second-home fraternity has meant that where you used to be able to navigate through because a standard car could pass a parked car or an oncoming car, there are now child start gridlocks. Or there were: they have had to introduce double yellows.
In a London street (presumably any city) there are many places where two standard cars could pass , with some nifty manoeuvring or good spatial awareness, but the extra width of the big 4x4s makes it not possible .
Of course that 's the same for Tesco delivery vans (and Ocado 
) and trade vans. But they keep us on the move in other ways. Massive passenger family vehicles in cities, not so much .
As for 'need', I begrudge every penny I spend I cars , not my thing . I am about to buy a tent I really don't need. It will be less practical in some ways than my current tent, but I just want it because I love it. Luxury!