We have vehicles that do that now, and we all get to ride in one sooner or later.Agreed totally and even if we could solve all the issues isn't the point of the car to take somebody somewhere. Can't quite see how taking nobody somewhere is beneficial.
There is a beneficial effect after all
preventing a terrible smell.
I believe such a vehicle is called a "Hearse"
And if the technology fails that's what these vehicles we are discussing end up being!
(perhaps they need an inbuilt cremation app?)