…Who is going to build it? I’m referring to the engineering companies that will actually design and construct “the wall.”…[H]undreds of companies are lining up to build it—and that reflects the willingness of many companies to profit from divisive politics…But how much of the decision-making process will discuss the ethics?...Social justice advocates see the wall within a broader discussion about immigration, and engineers should, too…[T]hey should think of the social and political implications of the barriers that already exist between the U.S. and Mexico, and they should evaluate the social, political, and humanitarian implications in the context of another wall born of divisive politics—the one between Israel and the Palestinian territories of Gaza and the West Bank…In today’s political climate, engineers cannot remain passive…