"Extreme vetting" is utter horseshit. It's merely a method of executing a Muslim ban by degrees when none is warranted or useful. This is especially true as it applies to refugees from Syria seeking to escape from the kinds of people we are supposedly protecting ourselves from. The refugees want the same thing we do. Safety and freedom. The US used to be the shining light of such things. But the Trumpisti are determined to violate everything good about the United States as understood across the world for centuries.
To those who disagree, your fears are unfounded. Your "belief" has no basis in measurable reality. And this reality CAN and HAS been measured. Call it what you want, but the process of vetting which has been in place for over 30 years is pretty damn extreme. Much moreso than anything in Europe. Follow the explanation and links in this article which is from June 2016.
Educate yourself on what it is you're actually ranting about when it means that genuinely endangered people will be consigned to death because you wouldn't extend your hand as an American when they reached out to you for help.