This strikes me very much as a classical cognitive failure: An inability to understand that other people actually, truly think differently than you do. E.g. Other people actually believe that God is real. Actually, truly, like he's really there. And they'll act like it.
And to your point, even though it is an incorrect analysis of the situation - what makes you think that people just do what is inherently good and right? Prisons exist in every country for a reason.
My spouse is an Iranian national and affected by the ban. I'm from Germany, where we live. Why can't the Trump administration vet her, given that previous administrations could and did?
Previous administrations may have extended that trust, but that doesn't prove they were correct to do so.
Why haven't they done it nearly a year later? Probably a good indicator not to blindly trust autocrats who run election campaigns on xenophobia.
Free speech but when free speech doesn't work ban the other speakers and live in a bubble. Awesome.