But on the other hand I think it does somewhat go with the DB territory. We "act as if" everything is going to go swimmingly and then if it doesn't we are bound to have some negativity about that.
"Acting as if" everything is dandy doesn't need expectations to be met. If everything was indeed going fine, then we wouldn't have to act as if they were, so when things don't go fine... that's a given. Whether expectations would've been met or not, one is still able to "act as if" everything's just fine.
If negativity sets in because expectations aren't met, that's where detachment comes into play so as not to have that kind of emotional reaction - and not having expectations, of course.