...well... I would say that, while emotionally very effective, the book was not very useful, in that it didn't provide any analysis, any suggestions or directions for how to make things better. In that sense it's a lot like Uncle Tom's Cabin and not so much something from which we can learn. Things actually are better now than they were - no doubt partly due to the book and how it was received, all of which had much more to do with the international situation at the time than with the actual conditions on the ground - but unfortunately we're not actually less racist; we have only learned to APPEAR less racist. Even that is a good thing, of course; but much more progress is possible, and we seem to be stagnating, as the murder of George Floyd kind of indicated. Adventures of Huckleberry Finn, a much earlier work, actually provided a much more useful analysis of the moral issue, and something from which we all can still learn a great deal if we will (we won't, I know, but we could). You noticed that Mockingbird is not actually a children's book; neither is Huckleberry. Give it a try, if you haven't as an adult, and see what you think.