there are a lot of issues that make the generic people dumb but the major culprits are bad schools, bad parents, media, substance abuse, bullying etc that all can effect the important years where the kids are able to learn the best, combine on top of that with lack of access to higher education due to whatever reasons and you get people who already got dealt a bad hand with IQ but now are uneducated on top of that
>>317729594
>neglected kids survived in time of savagery so it's okay
back in those days being squeamish about killing someone in combat was considered being craven and was seen as bad a thing as a mental illness