Your opinions from what I have read largely are based upon ignorance. Certainly that is the case on this subject.
The reason history repeats itself is because people are ignorant of what has happened in the past and have made the same mistakes.
Visual evidence makes history concrete. When it is just in a book it is easy to make abstract and to trivialize. Holocaust deniers would love for the Holocaust museums to be shut down. They don't want the history of the Holocaust to be shared. And why do you think that is? Because usually people who deny the Holocaust hate Jews, and when other people see first-hand what the endgame of that kind of hate can be, they tend not to hate so much.
It is easy to hate people in the abstract, as an idea. It is difficult to hate individuals on the basis of race, or religion, or things like that. It is hard to hate when the evidence of what that hate entails is shoved in people's faces.
The same dynamic works for slavery. There are lots of Southern partisans out there who would love to romanticize the Old South. They would love to make it seem as if blacks are just exaggerating about how bad slavery and segregation were. And if the only place where those things are talked about is in a book, then it's easy to say that the book is just slanted. And like I said before, when it is just words written on a page, and the only notion people can have of history is in the abstract, then it is very easy to rationalize that it really wasn't that bad.
But when you can point to a building and say, this is where black slaves were bought and sold like cattle, then the atrocity becomes concrete, and the dissonance between what people believe is decent, and the evidence of what the behavior of people was in the past, is clarified.
There are lots of Southern partisans out there who love to claim that any of a million other things were the reason the Confederacy seceded. They would love to claim that slavery was just a side issue that was fading away anyway. But the visual evidence of just how wrapped up in the ins ution of slavery the economy, infrastructure, and everyday life of the South was, shatters that argument.
If the reaction of Alabama police to the Selma marches were just printed in prose form in the New York Times, rather that broadcast on television, do you think the Civil Rights movement would have gained the moral high ground that it did?
This is why, as has been mentioned before, that Jews frequently are heavily involved in these Holocaust museums, and why black people involved in Civil Rights activism get so involved in the memorialization of the atrocities and abuses of the past. They want people to know.
Because if we allow these things to be whitewashed, we raise the chances that they will be repeated.