Disfellowshipping even repentent child molesters would be a good faith move to make clear how "abhorrent" child sexual abuse is.
Yes, I absolutely think it should disqualify one from being in the religion. Disfellowshipping is the only way that the congregation gets a formal warning about this person's poor judgment. Since the cong can't /won't tell the reasons why, keeping someone disfellowshipped is the only way WITHIN THE CONFINES OF THE RELIGION to guarantee that members won't have contact with the pedophile.
Jeeze, pedophiles have to register on the child offender registry, are prohibited from living close to schools, and are outed on Halloween where they have to post a sign warning trick or treaters to stay away. For life. (at least in the US)
So, how, konceptual, is it a problem for admitted (by the very fact that they are "repentent" ) child molesters to be excluded from the congregation permanently?
And this doesn't even touch the fact that these admitted, "repentent" child molesters are unreported to the police, and none of those civil protections can be enacted unless the law compels them to.
DFing would be the only protection other congregants could get.