Worth noting that most car drivers have insurance. If you carelessly run over a child, you'll feel bad, but the insurance will pay for all the court cases.
If you run over a child on a bicycle, most cyclists don't have insurance, and there is a reasonable chance you'll have to sell your house to pay compensation to a child who is now in a wheelchair for life.
Car insurance liability limits will be insufficient if you kill someone, and you’ll be on the hook for the remainder. Umbrella will cover you in both scenarios.
If you run over a child on a bicycle, most cyclists don't have insurance, and there is a reasonable chance you'll have to sell your house to pay compensation to a child who is now in a wheelchair for life.