That's really nitpicking. Besides, Civilization is the kind of game who actually benefits from real diversity of cultures for gameplay reasons. I enjoy both Civ V (mostly with the Vox Populi mod) and VI and never felt the games were preachy about muh diversity despite the obvious market pitches about female leaders and blah blah.

Besides, you can always create a map and specifically play to genocide whatever people you seem formidable (although, since Civ V doesn't allow you to raze conquered City States, you can't just raze Tel-Aviv - you can still nuke it).