I had a crash on my ride to work a while back, it was on a section of bikeway that's hundreds of meters from the nearest road, so only pedestrians and cyclists in the vicinity. I'm sitting on the side of the path, blood & grazes over about half my face and dripping from my hand (apparently I punched the front chainring on the way down somehow). Several cyclists passed me, not a single one stopped to even ask if I was OK. Ultimately I got back on the bike & rode home to scare the shit out of my wife walking through the back door all bloodied unexpectedly.
Contrast that to the time's I've spilled out on the mountain trails, first bike up has always stopped to render assistance. Different attitude I guess?