There is at least one more aspect to this , other than lack of empathy, I can think of. Some people (ahem) are pathologically shy. Getting up in front of all t

There is at least one more aspect to this , other than lack of empathy, I can think of. Some people (ahem) are pathologically shy. Getting up in front of all those people and offering the seat to the injured person can be a physically painful act since it draws so much attention.