A wave of book bans have hit school libraries in the last few years. (Getty Images)When author Alex Haley’s “Roots: The Saga of an American Family” became part of the American psyche in 1976, first as a best selling book, then as a beloved television miniseries, it sent scores of Black Americans in search of their own family’s genealogical history. “Roots” also changed the conversation about race in America, serving primarily as an entry to such…