Yes, let’s erase all history that makes use feel uncomfortable. Keep the ones that make you feel comfortable, until it doesn’t then tear it down next.
You make a good point. The Colosseum as history might be worth preserving, like Auschwitz; but not as an object of pride.
Here in the USA, when schools become mass-murder sites, the tendency has been to replace them https://www.cnn.com/2022/05/31/us/schools-after-mass-shootings-uvalde-texas/index.html .