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I share your basic sentiment about vandalism. But I think you're missing the back story.
There was a long standing campaign to have a plaque explaining his role in the slave trade (~5yrs iirc) that was essentially ignored.
It's hard to think of a justifiable reason why the local authority of a city (that only is what it is because of the transatlantic slave trade) would do that. It's such an obviously reasonable way to balance the history of the city.
I just don’t believe in destruction. I prefer to believe in continuous improvement.