I think most people simply don't understand the process, the work, and yes the vetting of individuals seeking to come to the US.
Let me sum up. I think many just assume that it works like this: You're living in a country that becomes unstable. You pack up your belongings and fly to the US, perhaps we even fly you here on a magic carpet. You get to immigration and they usher you in and give you a place to live, money, food stamps, and whatever you need! It's magical.
Except that from most countries, you need a visa to come to the US. Good luck with that in many cases. Visas are granted in blocks and quotas and vary from place to place. And the state department monitors developments around the world and updates its policies regularly.
Say you manage to get a flight and come here with no visa, and head to customs. Question one is about your intention, and based on your passport, you likely would be sent to a detention camp. And welcome to legal limbo.
And realistically, how many foreign nationals can afford to get out and make their way to the US, or could even find passage.
No. For the vast majority, they enter the refugee program. The state department assembled this guide to help you understand how complex it is.
And from some regions, there can be even more vetting. It's harder than this. And we're talking months - or even years - before you can get here.
So shutting down 7 countries to allow for more vetting - or whatever nonsense is spewed - is just a load of crap.
Could the process be improved? Sure it could. Is it perfect? No. But it allows for a fair process.
https://www.state.gov/documents/organization/266671.pdf