What is inexcusably divisive is attributing quotes to someone that they didn’t say.
Especially the terrible racist quotes they falsely assigned to Rush. This Sanchez guy is a real sicko.
So CNN does not wade in the waters of infamy by standing by bogus quotes, it climbs the high ground saying we should not sustain "divisive" characters. As you point out, all the divisiveness come from those who propagate bogus quotes.
This is a tactic abused by the left time and again against Republican or conservative personalities. First defame the man and brand him to be "divisive" because of a furor the left self-created, and piously insist that he should therefore be quarantined out of public discourse.