Are you sure about that, isn't that why BLM are calling for a different slant on history, from the perspective of the slaves, not the masters. Sorry if I've misunderstood I thought present day history books are being accused of glorifying bad things (as you put it!)?
All History is written from a certain perspective, usually from the point of view of the victors not the vanquished, isn't this why there is now this argument that the story from both sides needs to be written to ensure a balance.
The problem with the 'blanking out' in history something you don't like, or society now finds unacceptable, is that this doesn't change what happened, and worse still it doesn't help to understand where modern day values and/or the pain comes from. 'An eye for an eye' leads to a world without sight and understanding and more than anything ensures past mistakes will be repeated.
No, statues are being accused of glorifying bad things. The books (along with the primary sources and archaeological sites...) are fine.
History is written from the perspective of many actors. The victors write. So do the vanquished. So do the people in between. We have Nazi's perspective on WW2, Americans' perspective on the Vietnam War, slaves' perspectives on slavery in America, and so on... Proper history considers all these perspectives to try and stitch together a coherent picture of what happened, as best as they can. Yes that process is fraught with bias and it's imperfect but it's definitely more nuanced than "the victors write history"... not what I've read.
And no one is calling for books to be burnt or museums to be razed to the ground. Statues erected in recent times offer a minimal benefit historical wise. There's nothing about the Confederate statues in Richmond that I can't find in a book. However it's not about the historical value they provide, it's about their position of veneration that's the problem. Not that much for me personally, but for a lot of people in America. Those statues weren't erected as some sort of history lesson, they were erected as a "feck you" to a war waged (in part) to end slavery. So take them down, and put them in a museum, with that exact caption.
Here's a obelisk in New Orleans that was taken down in 2017.
Read the inscription here.
New Orleans is home to many African Americans. Imagine driving past that to work every day.
That blatant caption is the spirit in which many statues were erected across the country. What possible value could there be in keeping them up?