People of good will can disagree about what to do with the tens of millions of illegal aliens living and working in this country. Should these people receive amnesty? If so, what must they do to make themselves legal residents, and, for many, productive citizens? But there should be no disagreement about the need to stem the flow of illegals into this country. The border must be secured before we can decide what to do with those already here. The next time you discuss this issue with someone who is angry about the Arizona law, ask first whether he or she believes we have the right and responsibility to secure the border. If you cannot agree on this necessary first step, there is no use talking about the rest.