How does the border wall solve the alleged illegal immigration problem when they could just hop on a flight and ‘miss’ their return flight home?

Question

EDIT: Learned that many countries are required to have a Visa before entering. They cannot travel to the US, even for tourism, without it. As a privileged American citizen, I naively thought anyone can travel anywhere for tourism purposes with just a passport.

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Answer 1

One, if you come in with a passport and never leave, they have your ID and can issue a warrant for your arrest; but they won’t come looking for you, if they don’t even know you’re here. Two, some people are simply not allowed into the US, even with a passport. And three, a lot of those people can’t even afford a plane ticket.