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There is a difference between diversity of "the place where you are forming an opinion", and diversity of what that opinion is.
By saying that a council needs to equally represent diversity of opinions completely ignores how widespread those opinions actually are. Decisions about action to take about going "defcon 3 on the jews" should not need to be decided by a council where you're focusing on equity of diverse opinions; ie, 50% of people think anti-semitism is bad, and 50% think anti-semitism is good. It's a bastardization of the word "diversity" in order to support whatever fringe belief is up for discussion.