What Part of ‘Illegal’ Don’t You Understand?

America has a big problem with illegal immigration, but a big part of it stems from the word “illegal.” It pollutes the debate. It blocks solutions. Used dispassionately and technically, there is nothing wrong with it. Used as an irreducible modifier for a large and largely decent group of people, it is badly damaging. And as a code word for racial and ethnic hatred, it is detestable.