It's minus 40C outside, and all roads are covered in snow, with 80km/s wind. Would you rather drive you own car, clear your own drive way, have to walk from parking to where you work downtown, or having your car break down on the side of the road and fixing it in the extreme cold?
How about just have some buddy pick you up in a carpool? There you go, the lower car owndership and the minivan advantage.