Why we don't enforce our immigration laws

The other great article I read today is at National Review Online. With plenty of examples, it exposes the real reason we have so much illegal immigration. Too many businesses want it, and their demands are heard by their Congressmen. Whenever the INS tries to enforce our immigration laws, businesses scream to Congressmen, and soon the INS soon bows to the pressure. The American people have decided, through their representatives in Congress, not to have open borders, and to pass laws to enforce this choice. If the federal government tried to enforce these laws and failed, then one could argue that, as is the case with the war on drugs, the laws need to be changed. But the hypothesis is false; what is occurring is a mockery of the rule of law.