There is a right way and a wrong way to broach sensitive topics. There is also a time and a place.
The problems are many. For every WEB site that says someone did something to someone else, you can find another site that says the complete opposite.
Basically, WEB sites are not the most trustworthy of sites for correct history. So, now you have a premise where you are garanteed to have problems in the discussions.
People use these types of "shock" posts for their own agenda as well. Trolls, or people looking to make others miserable, or instigate bigotry and so on.
A public bulletin board can offer a wealth of good information, but it can also offer up the most atrociously incorrect information as well.
When the discussions turn into an ugly mess and/or serve to create a potential rift in the community, they are not beneficial to HTC. They are not beneficial to the community as well.
It is not about forgetting history, it is about preserving our little corner of the world.
There could be all kinds of rationalizations and justifications tossed into this, but it is all irrelevant. If it is potentially harmful to any member of our community, then it is completely unjustifiable.