Lets look at the facts.
The World Government was made by uniting all the kingdoms into a single organization, the kingdoms retain autonomy but still respond to the WG, of all the Royal Families only one resides on their kingdom instead of living on Mariejois, Vivi´s family. The rest had descendants that we know now as the World Nobles or Tenryubito (Celestial Dragons).
We know that said WG was formed AFTER the Void Century, because during the Void Century the Alliance that would later become the WG, they defeated whoever made the Poneglyphs, and this defeated made this Poneglyphs so their version of what happened could be preserved.
So its clear the current top power does not want that truth to come out. Why? Well, we don´t really know. But its clear they obviously couldn´t destroy them, so the next best thing they could do is hide it. Deny its existence.
Of course, it would make far more sense for them to just fill in the blanks... but for all we know, they did try that. Not a lot of characters outside our main parties and antagonists know there is a Void Century in the first place, or if they do they don´t really care. Its not common knowledge. its a mystery reserved for the reader and our protagonists to find out. Remember, Nico Robin is not persecuted because she knows about the void century, she is persecuted because she could find out about what the void century actually is.
And its clear not all royalty knows about what this Void Century is about. For example, Nefertari Cobra, Vivi´s dad, knew about the Void Century and the Poneglyphs but had no idea what the Poneglyphs are actually about, and he is a Royal King, allied with the WG, why wouldn´t he know? Because the secret goes far about his level, all the way to the top, to the Gorosei.
Sure, as a subject history would be studied, but how much do we know about world history? If the WG knows that getting more people curious about it is a problem, of course they would avoid it, focusing on local history. Also the Void Century happened between 800 and 900 years ago from the current point in the story, how many reliable records could there possibly be? There is enough information in those 8 centuries to get a basic and even advanced education and, if no one knows there is something to hide there is no need to deny it.
The World Government was made by uniting all the kingdoms into a single organization, the kingdoms retain autonomy but still respond to the WG, of all the Royal Families only one resides on their kingdom instead of living on Mariejois, Vivi´s family. The rest had descendants that we know now as the World Nobles or Tenryubito (Celestial Dragons).
We know that said WG was formed AFTER the Void Century, because during the Void Century the Alliance that would later become the WG, they defeated whoever made the Poneglyphs, and this defeated made this Poneglyphs so their version of what happened could be preserved.
So its clear the current top power does not want that truth to come out. Why? Well, we don´t really know. But its clear they obviously couldn´t destroy them, so the next best thing they could do is hide it. Deny its existence.
Of course, it would make far more sense for them to just fill in the blanks... but for all we know, they did try that. Not a lot of characters outside our main parties and antagonists know there is a Void Century in the first place, or if they do they don´t really care. Its not common knowledge. its a mystery reserved for the reader and our protagonists to find out. Remember, Nico Robin is not persecuted because she knows about the void century, she is persecuted because she could find out about what the void century actually is.
And its clear not all royalty knows about what this Void Century is about. For example, Nefertari Cobra, Vivi´s dad, knew about the Void Century and the Poneglyphs but had no idea what the Poneglyphs are actually about, and he is a Royal King, allied with the WG, why wouldn´t he know? Because the secret goes far about his level, all the way to the top, to the Gorosei.
Sure, as a subject history would be studied, but how much do we know about world history? If the WG knows that getting more people curious about it is a problem, of course they would avoid it, focusing on local history. Also the Void Century happened between 800 and 900 years ago from the current point in the story, how many reliable records could there possibly be? There is enough information in those 8 centuries to get a basic and even advanced education and, if no one knows there is something to hide there is no need to deny it.