Well yes, I wasn't really suggesting that a shopping centre owner or council (or artist) would do such a stupid thing! But I am sure that IF they did, there would be various laws applied to stop them.
I am not saying that art should not be provocative (of course it should be allowed to be and modern art often is) but there is a difference between provocative and gratuitously offensive. It's a very very fine line though and one that art/artists in general (seemingly comedians in particular) find quite hard to negotiate. And yes, things do change. What might have been offensive or provocative in one place in one era (women's ankles, Le Déjeuner sur l'herbe, The Sex Pistols, long/short hair on men - it changes!) is not in another - and the other way around: what was once acceptable (Mind Your Language, The Black and White Minstrel Show, beating your wife, taking opium, burning old ladies with a cat, slavery) is no longer so.
So should we allow The Black And White Minstrel show to return on the basis that it is part of our history? Should women's ankles still be covered? I think that you can quite legitimately accept that things are part of the past (no revisionism, no whitewashing) without wanting them to be carried on into the present. Personally I think that applies to statues like this - I found it pretty amazing that it was still there in this day and age TBH. Is it important to remember both the good and bad this man (and others like him) did? Yes, I think so. Is a public monument praising him the way to do it? Not in my opinion.
The Black and White Minstrel show wouldn't return as I doubt there would be any demand for it so in effect things like that are self policed. By the opposite token of what if, using your examples, what if art with men with long hair is seen as bad so got rid of? Who decides what can and can't be got rid of?
Some religions have strict views on body parts being visible so why isn't it fair game for them to demand that penises, breasts and vaginas have to be covered up for modesty in paintings, statues etc? That has happened in history before after all.