A car would have to be some sort of magical hovercraft to approach silently, because tires rolling on asphalt make lots of noise whether the engine contributes or not.
This is true, but as a cyclist, often the sound of my own tires on the road, plus the wind in my ears and sometimes even my own breathing, masks the road noise of an oncoming electric car.
Reasonable point - I was thinking about it only from the perspective of a pedestrian, as I don't ride a bicycle myself.
I was almost run over by a Nissan Leaf 2 weeks ago because it crept up behind me on soft snow. It was only going about 5-10 km/h. They could definitely manage to kill a child.