Atrocities happen because the systems encompassing us are not perfect. Problems arise because we humans decide to live under the imperfect systems; vastly different by where on earth you happen to be. Metaphorically it's like when you travel, you're navigating into a new realm and where the game rules are completely rewritten for whatever the outcome will be and with whatever consequences. My intuition thinks this is a problem. The differences keep the world beautiful but separate us fundamentally in how things are handled.

I've been a victim of of a situation, that would not have happened if I had not been where I was and had been in a different country. I know it was an atrocity and in 100 years I could easily see people not believing it had happened & even today I've seen doubts.

Individuals are prone to question every possible situation with vastly different personal ideas. It's how great things come about. Disbelieving is also a result for some individuals and maybe it's dangerous but it's part of the equation. My assumption is energy should be focused towards making the systems around the globe more similar with trying to keep culture intact. Although the world may be safer for everyone without culture and just one nationality.

Lastly I think we have people disbelieving atrocities because compassion is piss poor compared to what we're capable of. People will focus only on themselves when the systems don't care about societies health (depending on where you live) and results in people being delusional or disbelieving what's in fact reality.