blind eye turners suck!

I always ask people on the side of the road/trail if they need help with a flat, even if I can see they have the things they need. Just in case.

I once needed help (my CO2 inflator wouldn't work and I couldn't pump my tire). Not one of the dozen or so people who passed me said anything. I eventually walked my bike 5 miles back to my car.

I would most definitely stop if someone had crashed. I stopped once during a tri to help someone who had crashed badly. Screw the race- it's more important to be a human being.