And what happens when a deer decides to bolt out from the woods in front of your vehicle?
Most likely, the computer system detects it more quickly than a person would, reacts faster than humanly possible, and brakes and/or steers in an optimized way to avoid both collision and loss of control.That kind of scenario is one where automated systems easily beat humans. The concerning ones are when visibility is poor, or lane markings are bad or confusing, such as in inclement weather or construction zones.
just hire Disney's engineers and building a fucking monorail in most cities and connect them to the suburbs
A train line is great if all the places you want to go are in a nice line. And we could certainly use better mass transit many places in the U.S. But it's only a partial replacement for driving, particularly with most cities/metro areas being laid out (or sprawled out, as it were) with cars in mind as the primary mode of transportation. Self driving vehicles are a more complete solution (even if they fall short of 100%) and much more cost effective when you consider that developing self-driving vehicles involves perhaps a dozen companies* conducting billion or multi-billion dollar projects vs. 5-10 dozen metro areas** (just in the U.S.) conducting multi-billion to tens of billion dollar projects to deploy light rail that would cover a fraction of the population over more limited use cases.
For better or worse, the U.S. has a car- and truck-centric transportation culture. If we were starting from scratch, it might make more sense to do things differently. But as it is, we have to work from the infrastructure we already have. Which means making driving better. A good way to do that is to remove humans from the equation as much as possible since human error is the cause of nearly all traffic accidents.
Plus, lots of people need to drive on a regular basis (daily commutes, etc...),
and generally don't enjoy it. So having someone (something) else do the driving is an upgrade for most people. Especially if there is no trade-off with the other up aspects of driving -- departing when you choose, making additional stops as desired, privacy and personal space, ability to carry around an amount of stuff that would be prohibitive on public transit, and store things in the vehicle, etc....
* With other companies buying components or licensing tech from the makers that do the best
** The U.S. has 382 Metropolitan Statistical Areas, over 100 of which have at least half a million population, and more than 50 of which have a million or more.