On whether Christians should keep supporting World Vision

World Vision USA has altered their employee handbook to allow them to hire members of committed same-sex unions. As I noted on Twitter, I find their rationale incoherent, but not terribly surprising.
Of the various threads I could take up, though, I want to focus on the decision which many conscientious Christians who deeply disagree with World Vision USA’s decision now face: should they continue on supporting the child that they had been, or should they send their donations elsewhere?