Imperial mystery

I've been interested in Imperial family these days since I visited Imperial Palace (not exactly a palace but the area where it stands). The guide who showed us around told me that there are about 1000 officials working with Imperial Household Agency (宮内庁), a half of which are working in the Palace. But what are the other half doing? They are taking care of various locations such as Imperial villas, Imperial Farm or Imperial tombs. "Tombs?!" I was especially intrigued by the word "tomb". To avail myself of this rare opportunity, I was quick to ask him "Is it true that the excavation of old tombs are not allowed?". He said "Of course, yes. They are their private places of sanctuary. People except Imperial members have absolutely no right to access them."
It's incredible that such sites of great historic importance have never ever been examined. When I came home I investigated about it. There are several speculated reasons why the investigations have not been allowed. One of them is exactly what the official told me. Privacy. But behind this official reason, there are a few that are rumored. Especially caught my attention was the following.
They (Maybe Imperial Agency) are afraid that
1) Excavation might reveal that our Emperors' ancestors came from Korea.
2) Excavation might reveal that tombs are wrongly identified. What we call Emperor Nintoku Mausoleum（仁徳天皇陵） has no definite ground that indicates it belongs to him. Of course it's because it has not been investigated!
Both reasons sound quite stupid to me. First of all we do have a right to know about the accurate history of Japan if not about Imperial privacy. Besides, although I am not quite sure whether the Imperial Family is a private or public existence to begin with, but I am positive they have an aspect of public entity as long as they live on our tax. Knowing exactly the origin of the Imperial Family is knowing our history because Japanese history before 700 AC almost centered around Emperors. At least our history text book tells us so and that's what I was taught. Even if they came long long ago from Korea, it's our history to embrace. In my view it has something to do with a deep seated feeling of disdain against Korean race. If this is the case, it's all the more wrong to hide it.
The second reason is even more nonsense. I heard that the identification of the Mausoleum was done under the Meiji government control. Soon after the return of the sovereign power from Edo Bakufu, they must have tried to authorize and justify anything imperial. Therefore it is highly likely that they might have rushed to a hasty conclusion when they tried to identify Imperial Mausoleums among a little less than a thousand possible Imperial tombs. Making a mistake is alright. We all err. It's already a history. But if it's wrong we have to correct it. If it's uncertain, what is the ground on which the Family (or the Imperial Household Agency) insist their ownership in the first place. It's so ludicrous.
We have a lot of controversial theories about our ancient history including where the Yamataikoku was located or the relationship between Emperor and Yamataikoku. As a scientist I am eager and dying to know the truth. I hope in the near future, hopefully within my lifespan, some of the tombs will be examined to reveal where we come from. I have a right to know it as a possible descendant of Yamataikoku people and as a tax payer.

Too long today.
The picture was taken in Kokyo, Tokyo. This is Fujimi-Yagura, the oldest building that remains.