I think that very traumatic experiences are often pigeon-holed to varying degrees as the psyche is just too over-flooded with stressful data to process it properly. A survival method perhaps, to keep the organism going and functioning. In the past (100years and further), there were no tools/methods to safely release these maladies from the mind, so we just got on woth things, perhaps even had to just to survive normal daily life. Observing people with majorly traumatic experiences attempting to release their effects, it's a tricky business and for some you are just cast into a fast flowing river where respite is often being whirled around in various eddy currents when you think you've managed to find the river bank.
Those generations preceding us were very practical, because they had to be, and the pigeon-holing and not discussing a part of that.