Dfd ones are used for only one purpose to set an example for the younger generation, and getting dfd is what will happen to them if they go against Jehovah!
I am a born in Jw and I became aware that after meetings overseer would make a special effort to talk with younger children and teenagers usually after an announcement of a recent disfellowship one.
It was always the same statements,"Becareful that you do not end up like her." Usually out of wedlock lady . He continued,"Do not speak with her,smile, you will be able to talk with her soon." At that time it was ok to smile at dfd ones!
I heard that almost for ten months. The lady got pregnant six more time, she had very nice children but got dfd every time. Heard the same thing over and over again. It stopped when I was in my teens, but I watched elders go up to other young children with their parents right next to them and give the same little warning. Until another became the example!
Did you ever noticed the sick talks about dfed ones? How sad they look and worldly. I remember one was before the memorial. They had everyone attend a special talk before the memorial. The speaker asked if they ever recall seeing how disfelloshipped ones look with worn out and torn clothes on! It was shocking that on memorial night they gave a special talk on disfellowshipped ones!