The biggest problem with paying welfare to immigrants is that it has to be paid upfront, long before there is a profit or cost reduction compared to not paying

The biggest problem with paying welfare to immigrants is that it has to be paid upfront, long before there is a profit or cost reduction compared to not paying it. The problems with not paying are manifold: They are an underclass, without most rights and very poor. A proper healthcare system can't refuse them treatments, for all sorts of reasons, and poverty and lack of rights just increase health care costs. Then there is the lost potential: Those people do have children, often naturalized, or not, living in the country, but not getting the care, food and education they need, which also means they don't fulfill their potential benefits to society. I think refusing children basic welfare is about the stupidest thing a society can do. Both for financial and for humanistic reasons. It is completely irrelevant whose children they are.