The thing about depression caused by past trauma is this: it is something foistered upon us, for sure, as all experience is, whether we seek out experience, or not. Good and bad experiences just roll in. But it is different to watching Star Trek and being really upset when Spock died...and having to wait until the next movie when he comes back. What we do to deal with an awful event, deep down, is to personalise it, to make it part of us, part of our fabric, our tapestry, as it is real...to survive it... as we can't effectively deny it. So, this black dog of depression brought about by experience, is indeed part of us and it is best to respect it as part of our wholeness. Periods of depression are not a black gap in life, but simply a way of progressing through life as we grow larger through...experience of life. Some experiences are really horrible the same as some are really wondrous. We don't have experts treating us for Too Much Joy...but depression is much the same thing, just the other side of it. Wise folk will say that every coin has 2 sides, and that is true to some extent. ..but there are maybe 5 or 6 more sides to it all that current wisdom doesn't know about yet, and never will.