Nor do we want to. Controversy and civility aren't mutually exclusive. There's nothing wrong with discussing a controversial subject, as long as the discussion is polite and factual: one can state opinions, and argue one's case, without being inflammatory.
"Once the writer in every individual comes to life (and that time is not far off), we are in for an age of universal deafness and lack of understanding."
(Milan Kundera, Book of Laughter and Forgetting, 1980)