It is causing a stir because Permanent Residents (green-card holders) were being told they were no longer welcome into the country. If Permanent Residency is no longer actually permanent, and can be removed on a whim, that is incredibly stirring.

The green-card omission was a mistake, fortunately corrected relatively quickly. The majority of this action, while disheartening and inconvenient for some, is temporary. That which remains and is being declared permanent will not be so. If you haven't learned by now, look closer (and check out Scott Adams recent blog posts). He consistently starts at an extreme and works back to the position he really wants. We are only at the very beginning of this process.

> The green-card omission was a mistake,

Only in that the political backlash was unexpected, forcing the Administration to backpedal.

Especially since it has been done many times before with little noise.

No, it hasn't, which is why most of the times people say this they do it without specific examples, and when they do provide specific examples they are immediately shown to be radically different than what Trump implemented.

>> No, it hasn't...

Yes, it has.