Mass deportations poll well, in part because many Americans believe immigrants should “get in line” and follow the law. However, the core issue isn't a nation's right to enforce its borders. When people are willing to overlook constitutional violations to “solve the problem,” they reveal a deeper disregard for the principles of liberty and individual rights that define America. If we abandon those first principles in moments of fear or frustration, we have to ask whether we still deserve to call ourselves a free society. Regardless of one’s views on immigration levels or deportation policy,...