I can tell you that when it comes to stupid, mindless behavior in traffic, pedestrians are right up there with motor vehicles and bikes of all kinds. I don't know how many times I've had people walk right out in front of me with out even looking up or to the sides, not to mention the old on the curb, off the curb, on the curb anna-one-anna-two dance.
Tapping the horn button to alert them before they get their head too far up their a** gets them to swearing as often as not. In this case, though, there's no real information about what led up to him killing her, other than he ran through the stop sign and failed to notice the pedestrian.
I'm 99% sure it was his fault, even if he spooked the lady and she lurched one way or another. He had the last and best chance to avoid contact.
Plenty of bikers out here will run signs and signals, but this shows the kind of risk you run.
The other thing that really annoys me with fellow riders is when they try that daredevil stuff like racing blindly around a bus that's starting to pull away from the corner, and then making a turn into a crosswalk full of pedestrians. Zooming down a crowded sidewalk is another good one. These adrenalin junkies just love to tempt fate.
Nothing at all funny about it, by the way. These jokes are not even a bit cute.