I disagree with the easy dismissals of "they're doing a poor job of purging history".
I don't think they're tyring to purge history, I think they (or more specifically, staff) are making a plausibly deniable political statement that can be dismissed as a bug.
They don't need to purge history. They only need to convince the newer generation that our country is based on injustice and tyranny.
That is how they will justify their future violent revolution.
The goal is create just enough distaste for the symbols and history of the country so that fewer people will fight for it when they decide to take over.
Personally, I also subscribe to the conspiracy theory that these efforts are getting foreign help.
I don't think they're tyring to purge history, I think they (or more specifically, staff) are making a plausibly deniable political statement that can be dismissed as a bug.