Sure, let's be an over-populated, chaotic version of China. Who needs all this open space and forests anyway. But why stop there? We might as well make everyone in the world a U.S. Citizen. And when they come pouring in by the millions every month to redeem their citizenship papers all the sharp folks over at the INS have to do is ask them if they are a criminal...as if it would make a difference anyway.
I'm not sure how such a reckless idea could possibly ever get planted in an otherwise sound conservative mind but you should at least consider this: The Communists Rulers of the PRC (along with every enemy of America) absolutely LOVE your ideas on immigration. I mean why wage a bloody war against America, one they would surely lose, when they could flood our shores on the cheap with hundreds of millions of their agents "wanting to be citizens" and take over our country by sheer numbers.
Want to see America vanish and re-appear as The United Nations of America?....just take off all limits on immigration--like you suggest.