And no-one is suggesting otherwise. What you don't get is that having public space occupied by publicly funded and maintained statues etc. whose explicit purpose is to offend part of the population isn't "people being allowed to disagree". It is the state shoving a fist into the face of people whose interests it is supposed to defend.
What you do with your own money, on your own time, in your own home or backyard, is a whole other story.
Changing things when the public perception of them changes is also the spirit of democracy. I'm old enough to remember when their used to be ashtrays in the hallway outside the lecture halls of universities. Then the perception of what is and what isn't an acceptable setting for lighting a cigarette changed, so we
removed those ashtrays. We didn't build a new series of universities, like the old ones but without smoking indoors.
What you're advocating is the spirit of an unchangeable divine order, not democracy.
...and build a new university without smoking in the hallway next to the one that allows smoking everywhere except in the lecture halls themselves?
Statues are focal points of hopes and aspirations. To see a statue is enlightening. No matter if you agree or disagree with it's creation.
Well that's just metaphysical woo.