Humans can go to prison [1], and depending on the state there are specific vehicular homicide laws or they are could be charged under normal homicide laws, specific statutes exist because vehicular laws can have higher punishment than typical negligence/reckless standards.

In California the charge can be anything from vehicular manslaughter to second degree murder, that means 15 years-to-life without parole, depending on other factors such prior(murder) convictions or if the victim is a peace officer and so forth.

In comparison self-driving systems do not have any punishment mechanism in the penal code. There is not even a well established liability standard, or ban/suspension threshold or any regulatory body equipped to audit a self driving system specifically [2]

[1] if found guilty - we may disagree on the mechanisms, effectiveness ,conviction rate and other details, nonetheless there is enforcement and there are going people in prison for this type of crime everyday.

[2] yes NTSB can do investigations but only for accidents (and give recommendations) and also has just 400 employees and $150M budget to cover everything from aviation to marine or pipeline and rail accidents.

In many jurisdictions you can run people over and kill them and as long it was a normal lapse in judgement or mistake they cannot charge you.

Only if you intentionally drive recklessly, for example speeding and racing, is it easy to charge a driver for manslaughter.

You're right, we should ban cars.

At least we can hold them directly accountable by the law.

We hold the driver accountable.