Gwen sells Jack so short it's almost criminal in the scene on the island where he is explaining what he did and why. He tells her point-blank that they were kept in prison cells like Weevils when he arrived at Torchwood Three, and that he personally arranged for them to have a home that cares for them as humanely as possible. He could have left them there or he could have turned them out into the streets to suffer...where likely they would have wound up in prison, dead, or worse. Same thing with Mwfanwy and the alien whale. He could have had either dinosaur or whale euthanized immediately, a la Harriet Jones and Hootie Jr in Fragments, but instead he saved and succors one and made a brave effort to save the other.

If you think about it, the time and money it must have taken to even get the haven up and running is staggering...hiring full-time, competent staff who can mentally handle working with people who are worse than insane (imagine being trapped in a hell like Jonah's and still being fully aware of what happened to you--god forbid!), renovating the old war bunkers and the lightkeeper's residence, regular food and supply runs, and comfort things like the movies and books in the rec room...staggering. It speaks volumes about Jack as a man and the sheer amount of compassion he must possess that he even attempted such a thing, let alone set up what was for all appearances a very competently-run and well-equipped sanctuary for all the human flotsam and jetsam of the rift. Gwen is so tied up in the fate of one boy that she can neither see nor appreciate the breadth and depth and power of what Jack has done.