I'm going to relate a jw family that I know of that highlight how disproportionate disfellowshipping is.
Both dad (elder) and mum are die hard jw. The son was always a nasty boy and when he got into drugs it just intensified his personality 10 fold. He's stolen and robbed from his family. Had 4 kids that he can't look after which have been taken off of him by the government. Served jail time. Just a very nasty peice of work. The guy is that bad I over heard his (non jw brother) say he wished that he would of been DF just to physically get him away from his parents. Now here's the point. He was never baptized so gets all the family support and to be honest I don't think he really wants it or deserves it.
Now his sister on the other hand. Was Dfed for sleeping with her BF. Other than that is a good law abiding person who takes good care of her son. A really nice lady but because she is dfed dosnt get a finger of jw support.