Those are some of the most common memories of past lives, due to the intense stimulation/trauma.
https://www.reddit.com/r/pastlives/comments/16txugr
One of the reasons the modern era is so fucked up is people reincarnating from wars from the last century are spiritually fucked up.
WW2 really pushed humanity to its limits.
We never dealt with the trauma, just started more stupid fucking wars.
Hell, look at Israel: whole damn nation has PTSD and is taking it out on their neighbors, when one of their 10 Commandments is literally the opposite.
Trauma destroys people, it's why evil people try to push it onto people, to make them weak and controllable.
It's also a big reason why so many people are just fucking done being willing to fight in wars; WW1 and 2 are so recent, people are straight up AFRAID of going back to that shit.
Big mistake the elite made because they are as good at empathy as Zoro and Sanji are at flirting. They think we're fearful because we WANT violence, when are violence comes from fear, and we're sick of feeling that way.