Perhaps what makes ABCs successful is their ability to focus on an
artificial goal that is set in front of them and pursue it with great
focus and drive. Even if that goal doesn't turn out to be particularly useful, having some direction is better than flailing around.
Success doesn't bring them any particular joy or happiness. The unlucky ones, After realizing that the goal is not what they want,
take it to mean that it has all been in vain and are set adrift. The
lucky ones are able to switch the goal with some other.