It doesn't seem like much of a trade off between 5 physically damaged and insitutionalized slaves and a couple of adult ten year olds that they captured.
I guess that there are very few clean / bloodless revolutions and the good of the many and all that. It's probably good that Willow has a hard time sleeping and at minimum the characters should be aware of the consequences of their choices.
Oh, they are a bunch of mixed-up, screwed-up characters in a deeply screwed-up situation. The world of the Keptverse is a real mess, basically.