I'm not keen on the article as a whole, but this is worth pondering:
More than that, though. One upshot of Trump's executive order is that United States lawful permanent residents, who have jumped through years of hoops to comply with the intricate immigration rules enshrined in U.S. law, are no longer protected by that law. They can be deported at the whim of the President, or his advisers, or a Border Patrol agent. (The order originally barred lawful permanent residents, though after some confusion, now it will not, unless the Secretary of Homeland Security wants it to. On the other hand, soon it may apply to citizens.) The nation of laws that they immigrated to is gone, replaced by a nation of arbitrary rule.
If the president can, without consulting the courts or Congress, banish U.S. lawful permanent residents, then he can do anything. If there is no rule of law for some people, there is no rule of law for anyone. The reason the U.S. is a good place to do business is that, for the last 228 years, it has built a firm foundation on the rule of law. It almost undid that in a weekend. That's bad for business.