Good question, I guess it's because, for better or worse, society is paying a lot of attention to black issues that were considered trivial (maybe they sometimes are?) or never really considered at all before. It is kinda fucked up that black people have to live around monuments that were erected to glorify the Confederate cause and effectively reaffirm that blacks were still second class citizens. I have a few black friends who have moved up from the South who have told me about how the legacy of racism and slavery is sorta always lingering, like you walk around and there's buildings and parks named after former slave owners, confederate monuments, etc. There's parts of the South where racism is still really dark and prevalent, I think today a lot of people tend to view stories of the KKK/white supremacists as sort of just "ghost stories" when it's very real in some parts of the country. While I agree it's a slippery slope, I don't think statues that embolden them should be kept up outside of museums.