
Originally Posted by
chicagogal
I certainly can't ride worried that every pedestrian will do something stupid and cause me to wipe out. I need to be able to trust (to some reasonable extent) the people around me to not be paralyzed by fear.
What needs to happen is replacing "worried" with "prepared." And part of "prepared" is never, ever, ever trusting anyone around you, except the people in your own paceline whom you've ridden with hundreds of times.
No, you shouldn't ride worried (besides taking the fun out of it, it slows your reaction time). But just as putting a helmet on for every ride is not the same as worrying about TBI, having the skills and the preparation to avoid a crash like that is not worrying. You need to be aware that while (most) pedestrians don't weigh as much as cars, 99% of them are even more unpredictable than cars, and you need to be able to respond to them instantaneously. Think of pedestrians as enormous cognitively impaired squirrels and you'll get the idea. 
No one's perfect - everyone's attention wanders from time to time - and that's how accidents like your friend's happen. (Shoulder injuries are horrible, so I'm sending her my best wishes for quick healing!) But you DO need to be seeing with your whole eyes, being aware of everything in your peripheral vision, not focusing excessively on any particular thing, person, or sector; and watching closely for the micro-signals that people give out before they're about to change direction. And you DO need to have the skills and reflexes to come to a complete stop at ANY time, turn right along with the right-hooker, accelerate past the one trying to turn left in front of you, stay upright if you have to leave the road surface, etc.
+1 that no one hears bells. They're just too soft. A bell came installed on my commuter, and I'd estimate that not more than one in ten people can hear it. On my commuter, I installed a pretty loud squeezy-horn. I use that in combination with hollered (and I do mean hollered) verbal warnings. Which many people don't hear or respond to those, either. If I were spending a lot of time on MUPs, I'd get an air horn too - as secondary warning at people who ignore my hollering.
Speed comes from what you put behind you. - Judi Ketteler