You make an interesting point regarding responsibility. Say that person were:

- Mentally deficient.

- A child suddenly running because thats what children do.

- A blind person making a mistake.

There are countries where if a pedestrian is crossing the road anywhere that isn't a designated crossing zone, then they are responsible for their fate.

In Canada and the USA, I believe that pedestrians "always" have right of way and drivers are supposed to be as vigilant as possible.

Of course, some pedestrians take this to heart and suicidally jump onto a road. In the US, this is more prevalent in walkable cities and college towns.