Monuments to evil: What do we do about them

I was reading the Economist and there was an article about old Confederate monuments and monuments to Southern heroes who are by all respects and purposes racists.  With the Confederate flag controversy and its removal from government land, should such monuments be removed as well?

The answer is not clear cut.  Some can be removed and some should never be removed.  The Economist writer believed that such monuments should have a plaque added that performs an educational function to inform people of our country's past and to serve as a reminder to future generations that we should not commit such atrocities and evil ever again.  Basically these monuments to segregation, slavery and massacres are artifacts and thus can become a learning tool.  

Another idea was to place monuments that countered the original message of the current monuments next to them or replace them altogether as a memoriam to the victims and people's defiance to racism and evil.  This is also a nice idea that people can get behind, but I don't like the idea of just replacing the "evil" monument with a new one.  Instead I would like a museum to be made to house these removed monuments when applicable or mock ups of the originals along with other artifacts of our country's racist past to serve as a reminder of what evil looks like so we can say never again.  These museums can be called "Facing History Museums" where we look at massacres, slavery, segregation and discrimination of all peoples in the United States.  As such, a section on Native Americans, Black Slavery, and Internment of the Japanese in WWII among others, and the 1960s discrimination and our nation overcoming these evils one by one will be included.   We can use these museums and monuments to say we have made mistakes and we want to embrace them so we never make them again rather than try to hide them.  

Conclusion:  I like the ideas of the plaques and of the alternate monuments that were suggested by the article.  However, under no circumstance should a monument be destroyed if it is possible to move it instead.  A museum with these removed monuments to Indian massacres, racism against Asians and more should be created or one per State in the major cities so that people can access the information there.  Even small halls in America's Natural History Museums could work and have artifacts dedicated to educating the public on the darkest parts of our history.  We have to say never again, and we can do this through education.