If novelists know anything it’s that individual citizens are internally plural: they have within them the full range of behavioral possibilities. They are like complex musical scores from which certain melodies can be teased out and others ignored or suppressed, depending, at least in part, on who is doing the conducting.
Tell the truth through whichever veil comes to hand — but tell it.
It might look small to those with apocalyptic perspectives, but to she who not so long ago could not vote, or drink from the same water fountain as her fellow citizens, or marry the person she chose, or live in a certain neighborhood, such incremental change feels enormous.
Racial homogeneity is no guarantor of peace, any more than racial heterogeneity is fated to fail.