When Trump ran for President he proposed a total ban on Muslim's entering the U.S. until our representatives figure out what is happening. The last part was foolish and the first part was evil. That he would propose such a thing was something that made him unacceptable.
Before long, he came up with a different proposal. This time, it was not Muslims that would be banned but rather people from countries that are sources of terrorism and rather than the ban lasting until we figure out what was going on, people from those countries will be subject to "extreme vetting."
Trump's executive order appears more consistent with this second approach, which I think is sensible. The administrative incompetence was incredible. There was no need for a rush. How hard would be to slow down new visas? How difficult is it to devote for resources to investigation?
Of course, this would not involve some dramatic "action" by Trump. It just would have modestly improved security.
It is just difficult to see Trump and his advisors as being both incompetent and cruel.