There’s no way to fully contextualise history on a plaque in the streets.
These statues are anachronisms from a bygone era. They serve no positive purpose for society. We need to better educate the entire population of this country about the darker aspects of our past and you don’t do that by keeping things built to honour these people in place.
Since you brought up the Nazis below, how many statues to Hitler or other Nazi figures did the Germans leave up?