Because you're supporting IMMIGRANTS!
Of course now it's not the "Japs" it's the "Wetbacks" we're intolerant of. Never mind that they contribute to taxes, to our economy, to the culture and identity of our nation, no never mind that, rather think about how they are stealing, overwhelming and committing crimes against white america.
Over and over America has tried to shut her doors when ignorance, hate and money come together. Eventually, decades later, people forget and it's not a problem. Kind of like how sushi is not a problem any more.
America has nothing to fear from the current and next generation of people coming to our country trying to make a better life. And if you're not descended from Eskimos or Native Americans then your ancestors also faced this same animosity... and yet here you are. Maybe, instead of looking for the enemy on the outside we should concentrate on the enemies inside our nation trying to scare us into giving away our freedom, sanity and self-esteem.