I don't see the analogy. "I hit you with a wrench" by and large implies intent. A pedestrian being hit by a car is very rarely an intentional event.

Further, you tend to have control over the wrench in this scenario (and if I was hit by a wrench because you e.g. dropped it unintentionally, "the wrench hit me" is reasonable), whereas insufficient control over the car is usually the problem in a crash.