Well when I started doing group rides there was someone designated to. Ride at the back with in riders. It was a task I did often. After retiring and getting back in to club rides again things have changed. No on stays in the back and they loosely sweep the ride.
I have been on ride leader looks back at the slower rider and just keeps going.
times have changed and riders are more into their own ride and not so much into helping beginners. They feel they should not attend a ride if they can not keep up with the group.
But that is the was society is today self inward looking and not thinking of others.