The default behavior in China seems to be "ignore and keep moving" while everywhere else usually at least one person will help immediately. I couldn't believe that so many people could look at someone so obviously in distress, bleeding on the street, and none willing to even call for help.
It's a big city versus small town thing. In the remote wilderness everyone helps each other. In the city it's assumed you are gong to get help from someone else.
Giving any consideration to strangers doesn't even cross their minds and it shows in all kinds of little ways: refusal to yield any space, be it a lane on the road or part of an aisle in a store, public spitting, urination, and yes, defecation, refusal to queue or allow people to exit trains, elevators, or other vehicles before pushing in. Also, strangely, it's not the young punk kids annoying their neighbours with their load music, it's hordes of middle aged dancing aunties.
Actually, all we see are the things we see. No one has a terribly precise way of knowing what the real world distribution of good and bad behavior are, yet there is no shortage of people who believe very strongly that they do. It's one of those quirks of the human mind, but it can be overcome with effort.
Hans Rosling says we are instinctually inclined to watch for danger (aka bad news) than for safety. Ha. Makes me ask when was the last time someone pointed out a safe thing. "Watch out, that pizza in the fridge is still good."
Edit: Source for Hans Rosling: the book "Factfulness" (highly recommended—it is really a meta-discussion of how do you talk about good news with people)
There was even one incident where a group of people lifted a car up to save the girl that was run over. Or how a taxi driver jumps into a manhole to save a girl who fell in. Or how a group of delivery guys caught a child that was hanging on a several story perch. However, those news reports are rarely ever reported in Western media.
All we see are the bad things.