Who's Priority?

It is amazing the way we treat each other at times. From a moral standard you would sometimes assume that humans would be a little more sensitive in regards to certain people. For example, the aged, crippled, deformed or sick.The government do make an effort at times to create certain priorities but maybe these are not sufficient.Many private companies also create special services and facilities for people like these.
I am annoyed about this trend I have been seeing on the Marta public transport system. I am very aware that there are priority seating for these people on the buses and the trains, however, they at times do not enjoy the liberty of using these. The reason for this mainly is that other able bodied persons have deprived them the chance! Why?
I understand at times that we all can be tired while traveling these systems but at least when there a need for the use of the priority seatings for the intended purpose, please give them up. On Friday, I saw an old, shaky lady entered the Marta train with few bags and hardly walking. She looked around and all the priority seats were taken. Of course these were occupied by some strong, able-bodied folks, who sat there looking as if they had no clue they ought to offer the old lady the seat which was meant for her! I was so ashamed. I myself was standing so I could not offer her a seat.
After about ten minutes of ride, a young lady got up from one of the regular seats further away from the old lady and offered her the seat. She accepted and sat with such a deep sigh I could actually feel her pain.Sometimes I wonder if this is the way some of us treat our own family members who are ill, aged or handicapped. It is sad. We ought to really think about this and try to make a change.