Is there any indication we shouldn't be depressed? Are you...

Is there any indication we shouldn't be depressed? Are you living on the same planet that I am? Do you ever think that depression might be the reasonable human response to the crap we're going through as a species, meant to propel us into the next evolutionary step or, at least, into taking some different course of action, so that we might survive? Do you ever think that maybe it's the happy people that are really screwed up in the head?