and if robo car kills an kid who will do the hard time?
Same as when a person does: no one. Car "accidents" i.e. crashes are treated more like an act of nature than either a collisions cause by an individual making poor decisions, and more importantly (especially in North America) by a system set up to rely as heavily as possible on flawed human decisions with little thought to inherent safety in road design.
Basically, people don't really care.
I think you are wrong. People do hard time in cases of traffic accidents. Especially if it results in fatalities. For example, in Canada:
Impaired driving causing death: 4 to 10 years
Dangerous driving causing death: Up to life
Criminal negligence causing death: 4 to life
Hit and run: Up to life
The above are just general figures.
A few actual examples:
Sentences for fatal vehicle accidents (2020–2025):
High-profile impaired and dangerous driving cases
Brady Robertson (Ontario):
Accident: On June 18, 2020, Robertson killed a mother and her three young daughters in a crash in Brampton, Ontario. He was driving with THC in his system at eight times the legal limit.
Sentence: 17 years in prison, with a 20-year driving ban after his release. He was found guilty of four counts of impaired driving causing death.
Akam Jot Sandu (Ontario):
Accident: On September 11, 2021, Sandu, who was drunk and high on marijuana, drove 124 km/h in a 60 km/h zone and killed a ride-share passenger in a collision.
Sentence: 8 years in prison for impaired and dangerous driving causing death.
Deepak Chararma (Halifax):
Accident: In 2024, Chararma was involved in a fatal hit-and-run that killed a university student in a marked crosswalk.
Sentence: 4 years in prison for criminal negligence causing death. He had fled from two other collisions on the same night and was driving 126 km/h in a 50 km/h zone.
Tara MacMunn (Toronto):
Accident: On April 18, 2023, MacMunn, an unlicensed driver, caused a four-vehicle crash that killed a woman.
Sentence: 4 years in prison after pleading guilty to impaired driving causing death.
Artur Kotula (Toronto):
Accident: On October 12, 2021, Kotula, a suspended driver, sped down a residential street, killing two people in a collision.
Sentence: 6.5 years in prison for dangerous driving causing death. Kotula, who is not a permanent resident, faces deportation after serving his time.
Mathis Veillette (Quebec):
Accident: In 2023, a drunk driver caused a crash that killed Veillette, a passenger in the other car involved.
Sentence: 6 years in prison and a 12-year driving ban for drunk driving.
Truck driver involved in Highway 400 crash (Ontario):
Accident: On June 25, 2021, a truck driver on two hours of sleep caused a highway crash that killed four people, including a family of three.
Sentence: 8 years in prison. The judge stated that a message needed to be sent to the trucking industry about driving without sufficient sleep.