Some people don't have that privilege. Ever known someone that works two jobs trying to make ends meet? You don't have a choice except to drive home from work.
And will it be easier to make those ends meet when you are dead, or paralysed, or locked up because you left someone else dead or paralysed?
The arguments that a few people are making here, as if not driving while so tired you might fall asleep would cause some devastating loss to society and herald the end of life as we know it, are just silly. Only a very small number of drivers would be affected, because fortunately most people aren't so irresponsible in the first place. And given the extremely high likelihood of those few drivers getting themselves and, worse, possibly many other people injured or dead, with all the negative consequences that will imply, it still doesn't make sense from a greater good perspective.
Oftentimes for people forced to work 2, 3, 4 or more jobs just to survive, these are also acceptable "solutions" to the problem. The risk analysis comes down to [low chance of dying now driving impaired] versus [medium chance of dying later, homeless/starving after losing job(s)].
I once arrived at work with blood all over my face, neck, and hands from biting my lips to stay awake.
Autopilot is so far, far, far out of reach for most people working multiple jobs that it's really a non-issue not worth debating for a long time, but the technology behind it would be a literal lifesaver if it were more widely available to the unfortunately large population of people that are forced to drive regardless of mental state in order to survive and/or provide for their families and/or other circumstances "out of their control".
Before then I walked if I had to, sometimes over a mile depending on the destination, or took public transportation.