Well then now that you’re divorced you need to go find a job. Sure it may not pay as well as it might have but you had the pleasure of staying at home and spending time with the kids. Why is the working person the only one punished in this situation?
Alimony is useful in a context where wages are sufficient for one parent to stay at home full-time. Part of the reason it seems so out of place today is that as a society we've let average wages stagnate so far that living on one wage is impossible for most couples.