IMHO...
When you think about the numbers, America can’t handle asylum requests except for public figures, or spies we had working for us, etc. That type of asylum request can always be handled, since the numbers are small, and it has to do with America doing the honorable thing.
But there are billions of people living all over the world under harsh regimes that would kill them at the drop of a hat for uttering one peep against the regime, or even just for kicks. Anyone in China who was disgruntled, if they escaped and came here, would be subject to some nasty treatment if they went back to China. Well, that is potentially hundreds of millions of people. We just can’t accept half the Chinese population, or half the population of Sudan, or any country for that matter into our country. It numerically won’t work, it’s too many people that don’t fit in. They very often think contrary to American principles and are unemployable to the point of not being able to support themselves. IMHO, that’s a recipe for societal disaster. We have to start turning people back and simply advising people around the world to change their own countries - on their own - to adopt our principles. Because... they work. And that’s why America is such a desireable place to get to. But numerically, the rest of the world is going to have to improve itself. We have to stop sending food. Seriously. They must be forced to feed themselves. They can’t start out programming computers, they have to get to the point of successfully herding goats first. And growing beans. Etc.
Like Sam Kinison used to say...