Assuming you live in Europe. It's different in the US.
Some people do legitimately have a need for larger vehicles. The farmer I use to work for had 4 or 5 F-150s to be used on the farms (no way you are getting a regular car in and out of some of those waterlogged fields). Those were farm equipment, not something you use to drop off the kids at school. People who need vehicles like that to go grocery shopping are an extreme minority.
And I have never seen any of the roads around here closed, even when impassable by anything short of a snowmobile or a tractor.
2. Wasn't that image on a Photoshop hoax site?
3. That path is perfectly clear. Try driving a car with 4" of clearance through 8" of snow. It can be done with very good snow tires, but not nearly as quickly as a vehicle with more clearance.
2. I do not believe so.
3. This is true. You have to clear the roads for people to use smaller cars.