What’s the carrying capacity of Martha’s Vineyard? We found ourselves asking this question on Thursday when the island off Cape Cod announced that it was experiencing a “humanitarian crisis” after 50 people arrived there seeking shelter. These were reportedly migrants, some of whom may be refugees from Venezuela’s communist dictatorship, who had reportedly been flown up to Martha’s Vineyard on a plane sent to pick them up from Texas by Florida Gov. Rick DeSantis. The island’s officials announced that its residents, towns, and “community-based, non-profit” groups had sprung into action to provide food, shelter, health care, and other amenities to...