I realized those days were long gone when I was 18. Rush hour traffic at Dufferin & Steeles @ 5:30pm, car gets rear ended at full speed by an SUV (BMW X5 - no attempt to brake) while the old mazda protege stopped at a red light. Kid screaming and crying in the back seat bleeding from his face from the small glass shards, bus stop with 15+ people standing about 20 feet away. I pull over to help (as it happened right beside me), no one else moved from the bus stop, no one pulled over to help (not even the rear-ender which was too busy picking up the pieces of his car and swearing at himself).
I was on my way to work at the time and everyone else was too busy to do anything about it.
The speed at which Fire, ambulance, and police got there and set up a roadblock was remarkable. Within 3 mins of placing the call, they were all there.
TDLR; If people are too busy with their lives to help someone that could potentially be seriously injured, what are the chances someone is going to help a stranger with a broken down car?