I am talking about back in the barbarous times.There were brutality everywhere.There was no safe place.One could die any day.Now we get ruined even there is a slight threat to our security.People get PTSD if they are stressed for some time etc.I believe humanity is evloved for war , in war.But how could we withstand that much of stress?
Bonus Question : did human race got too weak to handle stress?
Depends what time period you're looking at.
Hunter gatherers have extremely low levels of depression and chronic stress. They typically get plenty of exercise, eat a healthy diet, and live in a close-knit tribe mostly consisting of extended kin, which are all beneficial for mental health and even health of the physical brain itself. They don't have media, debt, traffic, etc. Something like a long daily car commute is so unnatural for us in evolutionary terms, and as a result people get high levels of stress hormones in their blood from this extended type of stressful activity that is rarer in hunter gatherer cultures. People in hunter gatherer lifestyles are more prone to acute stress, in other words bursts of stressful experience in an otherwise lower-stress experience, which is healthier.
Middle ages and much of human civilization has been fairly miserable for those that were not on top of the social pyramid. Ratings of overall happiness from extremely impoverished countries today show low levels of happiness and life satisfaction, according to polls, which some exceptions like in Latin America.
The idea that humans evolved for war is almost certainly inaccurate, because people in the earlier paleolthic period are evidenced to be less warlike as a whole than people from the later neolothic period. Once humans tied themselves to land on a permanent basis (a small recent fraction of our total evolutionary history), we gave ourselves much more reason to fight wars over resources with neighbors. To some extent it depends on the tribe though; some were more aggressive than others, while many had very little violence.
Millenniums ago survival depended upon animal instinct, paranoia and watching your back 24/7.
Hunter gatherers have, as a whole, lower levels of stress hormones in their blood than developed folk. Their mindfulness of the present moment, including assessment of danger, doesn't translate to stress and paranoia the way that ironically many aspects of modern life do.
You talk as if PTSD didn't exist before now, and that people were better able to cope with stress "back then." It did, and they couldn't. And, I don't believe there was any evolution for war. People have always found reasons to physically attack and defend themselves.
My impression is that they didn't "handle" it, but simply lived with it; some succumbing to it, others not so much. And don't forget that years ago, stress or not, people didn't live as long, so it wasn't as much of a long term disability.
Years of life expectancy at birth by era
Paleolithic 33
Neolithic 20
Bronze Age and Iron Age 26
Classical Greece 28
Classical Rome 20–30
Pre-Columbian North America 25–30
Medieval Islamic Caliphate 35+
Late medieval English peerage 30
Early Modern England 33–40
1900 world average 31
1950 world average 48
2010 world average 67.2
source: Wikipedia
The numbers are a bit misleading in the sense that infant mortality and childhood death greatly skew the results for those early cases.
For the paleolithic period, as one example, and current hunter gatherer tribes in general, it's estimated that something like 30-40% of babies don't make it to age 15, but the life expectancy of a 15 year old is like 60, because they've survived past the riskiest part of life. So while one might look at that data and have a mental picture of 33 year old paleolithic folk dropping dead, which isn't really accurate. A more accurate mental picture would be a high rate of infants and children dying, with a much lower death rate after that.
