I took the family to ride to the MUP today. 13 miles and at one end is a grocery store. We decided to grab a slice of pizza there. After finishing our lunch, we have to walk our bikes from the outdoor table area, down a stretch of sidewalk, store on the left, parking lot on the right. It is a bit tight and busy.
A couple,in full kit, come riding at speed off of the path right on to the sidewalk. I am watching the whole thing from about 25 yards back. My daughter, who is 8, is in front walking her bike toward them. They refuse to dismount, slow marginally and keep coming right toward her. She gets scared, tries to move out of the way and knocks and errant grocery cart into a parking space, just as a a car is pulling in. Guy on the bike Yells "whoa!!" finally dismounts, cars screeches to a halt, driver looks angrily at her, as if it is her fault.
My wife, who is ahead of me, moves the cart and the guy says "who put that cart there?" completely oblivious to the situation he just created. I tell him that you are supposed to walk your bike off the path and he says "Yup" and gets back on his bike to ride the next 15 yards to the table area. I think there are a fair number of people out there who are so self-absorbed (car/bike/walking, etc) they don't even see you, let alone stop to think to ask if you may need help.