The benefit of that accidental generosity was the American deal: immigrants have to participate in the economic and political fracas of the nation, but without much of a social service safety “net.” On the other hand, they can get in.
这种附带慷慨的利益是美国的协议：移民 必须 参与到这个国家经济和政治的纷争中，但是却没有一个社会服务安全“网”。另一方面，他们可以进入到这个国家。