There's a problem inherent in statues.
You raise a statue to a great person, intending that it symbolize the good things they've done.
But everyone does bad as well.
Your statue cannot show a deed. It shows the virtuous and wicked doer instead.
It thus becomes a monument to wickedness.
When we knock your statue down, we knock down this wickedness.
By doing so, we also defame virtue.
In other words, the problem with statues to people is the same as the problem with people. They deserve to be raised up, but we are obliged to knock them down.