“Can we build walls?” he asks rhetorically. “Sure, we're gonna build walls. Can we make ’em taller? Sure, we can make ’em taller. Would that be a solution? As long as there's poverty, and as long as people are dying of hunger in other places, it's human nature. They will try to find better ways.”
Why are people successful here, and starving in Mexico? Obviously there are a lot of silly socialist answers to that question, but they're obviously hollow and unbelievable.
People need to keep asking that question.
He says that as long as there is poverty people will find "better ways", which we are supposed to intuit means "break into the other guy's country and guilt trip him into paying for me".
If that's "smart", then every Mafia guy is a genius.