Ladies and Gentlemen - EVERYONE in what is now the United States came from somewhere else. Humanity did not originate here; even the Native Americans are "immigrants" to North America. So let's please stop with the whole "native-born American" idea. Many of us were fortunate enough to be born in a particular area of land that has, over only the past 75 or so years, started to care about and protect the rights of more and more individuals. We should not conflate that luck with an absurd belief that we, as Americans, are any more exceptional than any other group of people on the planet. We've been LUCKY. While it is tempting to confuse good luck with talent or skill, it is also wrong.
If anyone believes that an arduous process that takes 18 to 24 months is not sufficient for "vetting," well, then, quite simply they are either blind or willfully ignorant on how detailed that "vetting" process is.