[protomyth]

> So what if anyone can come and go.

Nope. The border needs to be secure. There are people who hate the US and have committed violence against its people. This is a basic security problem and open borders would be a disaster. Your city argument is bunk, we are a country under a common Constitution, not a collection of city-states.

> And by the way, you can get smuggled into the US via the Mexican borders for like a couple thousand bucks

Yep, and the government needs to do everything in its power to shut that down. Illegal immigration hurts the chances of any legal immigration package.