"Unless they have given some sign of repentance..."
Even the traditional rigourist should be apalled at this statement, its meaning and intent. Who is to presume God's judgment, Jesus' mercy and the conscience in good faith of a person perceived or not perceived? 
The church of Christ is not some club that closes its gates on the presumption that rule has not been adhered or dues paid.
If this is the church of Christ, let s/he who is without sin.... To live in a "picket-fence" universe means that it applies equally and univocally to each and every person.