In general cars have also gotten safer for pedestrians[0]. Modern cars are lighter and made of plastic. There's better visibility, sensors, and for most vehicles the shape of the car has improved things.
American trucks are an interesting counter example but that's a more complicated issue. (The source has a comment that you can infer this being a concern with trucks but there's also a lot of sources on this that you can easily find)
For their inhabitants, maybe not pedestrians though. Speeding laws are in part for protecting pedestrians