Sure, there is relief and a feeling this was necessary and for the best - but also broken dreams, failing social expectations, broken friendships. I guess I mostly agree with you, but I think such traumas make for unpleasant experiences...
Sure, I agree with all that, but also I think it's simply part of life for many people. Not everyone has everything go well for them in life, and people frequently make bad decisions (I'll freely admit to that myself). What's important is how you handle things afterwards. For another example, look at someone who's a really bad drug addict, but then cleans himself up and turns his life around. Sure, it sucks that he had to go through that bad phase in his life and suffer many years (which could possibly be blamed on himself, though addiction is also a biological failing). But we generally like to celebrate these turn-around stories where someone takes a bad life situation and makes it much better. The ex-drug addict will probably always be scarred from his experiences, and always need to be very careful not to get into that trap again, but usually people are happy for him despite all that.