The following is all strictly personal opinion:
People have always been moody and suffered, . . . . especially if given enough time and "stuff." In the past folks didn't live much past their mid 30's to mid 40's. They didn't have electric light so their days were filled with work when the sun was out, then when it went down, eat/ritual/party around the fire, sleep and rise with the sun to work again. Forget about "retirement," and remember girls get married right after menarche and boys get married in mid to late teens. Literally, there was very little time to brood and be depressed.
In the modern world, not only do we live longer, but we have more free time AND we are better informed (if we choose to be) via electronic and other media and have more "stuff" than any people before us. Free time gives one time to think and brood and be depressed. Being informed makes it okay to talk about depressed feelings and seek help. Having stuff and seeing other/more stuff makes one want more - the more you realize is possible the more you want, in general.
So, we we sit in modernity, around our computers, feeling "depressed." People have time to think and talk about it more. People have ALWAYS suffered but in the past they talked to a priest or just didn't talk or dealt with it or some crisis or emergency came up that was more pressing like How will we survive the Winter? That does NOT mean it did not exist. Today we are encouraged to talk about it, it's not so villified and all the media tells us about the latest meds that can help turn our lives around . . . all we need to do is "talk to your doctor." We constantly hear about or see adds for the newest "stuff" that looks desirable but is unattainable . . . . . . it all adds up to this:
Never before in history have a people consumed so much, yet felt so unfulfilled.
"But even if nothing lasts and everything is lost, there is still the intrinsic value of the moment. The present moment, ultimately, is more than enough, a gift of grace and unfathomable value, which our friend and lover death paints in stark relief."-Rick Doblin, Ph.D. MAPS President, MAPS Bulletin Vol. XX, No. 1, pg. 2Hyperspace LOVES YOU