There are many real-life emergency situations where some people will be the first to help even when everybody else stands by, even risking their own lives to help strangers
Dispositional explanation for bystander behavior can be criticised by looking at Piliavin's research as evidence for aspects of social situation being important
When the actor appeared disabled, 90% of the time they were helped within 70 seconds. When the actor appeared drunk, they were only helped 50% of the time within 70 seconds