A better formulation: Cars in their current form and predominance are terrible. Done right, we would still have pickups for moving heavy loads, and some speedy form of transport for moving around individuals, but would it be two tons of steel?
Imagine a world with no cars where you make this proposal: each person gets a two-ton machine that can go up to 100 mph, its direction determined by a driver-controlled steering wheel. We're going to have people as young as 16, with maybe 30 hours of training drive it on a curvy 20-foot-wide road. Now the machine's only ~six feet wide, so we'll divide this road into two 10-foot lanes separated by a painted line down the middle. People will go 55 mph on one side while other people go 55 mph in the opposite direction just on the other side. It's safe, because people know to stay on their side of the line, except sometimes when they're expected to cross over briefly if they think someone else is going too slowly. As mentioned, the vehicle can go 100 mph. The only thing keeping it at 55 is that the driver is expected to press and hold a pedal at just the right pressure.
This proposal would be shot down so hard. Someone would probably object that this crazy idea is likely to end up being the leading(?) cause of death for people under the age of 30.
We're in a situation where it's the best we have in rural areas, but if we really thought about it, we could come up with something better. We need them in this world, because we built this world to need them.