How sad the world when in 2015 ISIS destroyed statues in Mosul's central museum and the UNESCO World Heritage City of Hatra. They claimed that these were false idols and violate their interpretation of Islamic law. In other words they were destroying historical artifacts and history because it did not agree with their current ideology. How does this differ from what is going on today. Removing plaques from the Langevin Block on Parliament Hill Ottawa to  Covering statues in Halifax. They are tarring down statues in the US because in they do not agree with the current ideology. In this respect we are no different.  Where does it stop.  Maybe all memories and symbols of Queen Elizabeth I' should be removed due to her treatment of Catholics. 
This is history leave it alone and teach what was right and what was wrong. It will be interesting to see how we are judged a few generations  into the future. 
"Those Who Do Not Learn History are Doomed to  Repeat it" George Santayana.