2) public transport is not wheelchair accessible. We have trains from the 70s on the track, and aside from multiple steps and a gap, there are no places for wheelchairs. Buses are a little better, but not really usable either. When push comes to shove, this requires people to lift the wheelchair and put it on the train/bus, then help you on the bus as well. If bystanders don't do this, I guarantee out here the driver won't either. For trains, you are supremely unlikely to find anyone of the public transport companies in the station, and nobody helping wheelchair bound people on the bus. Plus, you never, ever see wheelchairs on the train.
Note that if you look at the videos below you see that in most cases, disabled people need (much) more time to get aboard a vehicle. This is not available in public transport and is available in private cars.
Furthermore, wheelchair users (as visible in the second video) (and obviously only up to a certain level of disability) are not just able to use cars, but are able to carry and move heavy loads using them, like groceries.
So once again, an argument in favor of cars once a good look at reality is added to it.
[1] https://www.youtube.com/watch?v=R0usQ1LksSA