My very personal opinion is maybe it shouldn't be ok for humans either. Maybe the benefits of cars absolutely don't outweigh the contant risk of deaths and injuries they pose (especially in metropolitan aeras where they are easily replaced by other modes of transportation)
Reality is "because humans can take responsibility for their actions". And it seems the way our society is built, we'd rather have individuals take responsibility than question the system
But we see bad driving whenever we are out ambulating in the streets, anyway, even in a world with vehicles that are almost always operated by humans.
In this world we have today, illegal things happen on the road all of the time.
(And we've always seen it, at least in quasi-modern times. It isn't something recent. I'm absolutely certain that we saw it in the horse-driven era, too; we just didn't have much in the way of pocket supercomputers back then to record it with.)
Reality is "because humans can take responsibility for their actions". And it seems the way our society is built, we'd rather have individuals take responsibility than question the system