People championing these statues don't care about history, they care about their "idea" of history. "They been there for a long time, why change shit?"
Because we can do better
They are championing the status quo. "This is how it's always been" and how "This is how it's always been" is "RIGHT". The concept of thinking everything one has known is a lie, and that they've been unaware of the truth for MUCH of their lives is a hard pill to swallow. There are a LOT of ignorant people out there that fear this change, as it's like pulling the rug from under them.
Regardless, if you are a level-headed adult, you can come to peace with the idea that you are wrong and people around you that taught you such misinformation were also wrong. I think one of the key parts of becoming an adult is coming to the realization that nobody is perfect, and people you held in high regards as a child (like parents, older family members, teachers) are not perfect human beings, are flawed and make mistakes. But to a lot of people, questioning that shit is like a sorta sacrilege. "But, my parents are never wrong. The Bible tells us to honor them. Elders are ALWAYS wise. No 'but's, this is the definite TRUTH!". Some people just gotta get over it.
I think they place a similar false idea on some of these statues, believing in them as being something MORE than they truly are. Confederate statues don't acknowledge "heroes of the United States", but worship "traitors of the United States". Columbus was important to history, but was also a rat bastard that didn't deserve a statue.The work of these men and the quality of their character should be a means to judge whether they deserve a statue or not. Place statues that inspire Americans, be it a figure that has fought for equality or compassion, or an abstract statue of what good Americans can accomplish if they work together.