Unless they intentionally jump in front of your car in an attempt to commit suicide, it is always on you to ensure you can stop and respond to an emergency, and a pedestrian is such a thing, imho.
ALL users of the road are responsible for following the rules. Not being in a car isn't a "I can do whatever I want, whenever I want, whyever I want" pass.
If you drive a car and accidentally drive into someone who isn’t paying attention, that is also on you.
You are holding the bigger weapon. That means you have the higher requirement for safety, imho.
I track cars and race, fwiw, so it’s not like I don’t like cars.
In the most common scenario, it is the driver’s fault.
Of course there are exceptions to everything.
Anyway, I am not saying it never happens.
College kids are allowed to get drunk and act stupid.
You are still not allowed to hit them.