Discussions Why did Master Arca Jeth leave Freedon Nadd's belongings in the new tomb he ordered to be built?

The tomb was originally in Onderon, but after the Freedon Nadd uprising, Jedi Master Arca Jeth orders a new tomb to be built in the Onderon's moon of Dxun.

Darth Bane about 3.000 years later, in his search for knowledge, eventually goes to Dxun, to find Freedon Nadd's tomb. There he finds Nadd's holocron which helps him be much more powerful. Exar Kun also found some writings short time after the tomb was built. So...

Why did Master Arca Jeth leave Freedon Nadd's belongings in the new tomb he ordered to be built?
I mean, why leave them there? So later Siths can go and find them as they did? Why no taking them back to the Jedi temple or somewhere else and keep them secure?

Not to talk about the orbalisks and how they got there...

I want to know your thoghts.

 

This is a pretty good question.
Having read TOTJ last quite a while ago, the only explanation that comes to mind is a bit of a honeypot.

Sith artefacts from the Great Hyperspace War were stored in much more accessible conditions - a museum. Aleema and Satal Keto were able to get to it with ease, as much as anyone would and they used it to further their Dark Side knowledge. Perhaps it was assumed that a tomb was a more secluded place to store such dangerous objects. Moreover, the tomb of Freedon Nadd wasn't exactly a tourist landmark, it was well hidden in the inhospitable Dxun jungle (hence the vague KOTOR II name: Jungle Tomb). Perhaps Arca Jeth thought a hidden tomb would suffice to keep the information and the artefacts from those who would exploit them.
Storing a Sith holocron in the Jedi Temple might also create issues. It is too accessible to a number of untrained and inexperienced Jedi.

Now the question arises why keep such artefacts in the first place and not destroy them if they are deemed so dangerous. Perhaps Arca Jeth or other masters thought it might come in handy in the future? Or they were against the destruction of any kind of knowledge.