One powerful positive effect is just the dissolution of a poisonous marriage, if it was there to begin with. Children are able to know and feed off the animosity between their parents if they're truly unhappy together. In my personal experience, my parents getting divorced (and pretty much the disappearance of my biological father from my life entirely) was one of the best things that could've happened. If my parents hadn't divorced, I don't know how things would've ended up. And I would've never had the dedicated father figure I got a few years later. Yes, if there are children in a marriage, their well being should most definitely be taken into account - and if that well being is best benefited by divorce (that is wanted anyway) then odds are they will understand one day.