From what I heard, there have been a number of historians that aired concerns of factual issues pre-print who were ignored, and its marketed as a history book despite not being a history book.

One of the goals of propaganda is to cause disunity.

The idea being you divide people and conquer. You force people into psychological states where there are two minorities where some people don't react, and some who react violently at shadows, and it allows a smaller third group to do things that couldn't normally be done. That's the gist of it. You get them to that point by corrupting social norms, and other factors that make up individual and national identity. Its quite evil, and often uses sophisticated techniques that are designed to work on psychological blindspots we all have, the only defense for that type of material, is to limit exposure and view that material with critical thought and attention.

Obviously this kind of content would be harmful to any children younger than 12 as they would lack the developmental faculties needed to discern lies from truth and just accept what is provided.

American conservatives (myself included) generally dislike the book, for its incorrect account of the motives behind the American Revolution. But interestingly, many old-school economic leftists also disagree with it, as by incorrectly chalking up every historical injustice to "white supremacy", it obscures the economic forces that were the real driving factors. Some of the best rebuttals were published by the World Socialist Web Site, which is Trotskyist.