The reality is, this happens after elders deliberately spread malicious and slanderous mis-truths, or embellished stories about the "accused" amongst the flock.
Then, the ever present and powerful "gossip-mill" goes into overdrive until every last person has heard that "bro or sis so-and-so are not to be associated with...."
Been there...seen that...felt that.
Why let facts or truths get in the way of or affect a good old gossip??