First, there's the obvious issue that these three groups aren't (by and large) the ones that have driven a lot of the news coverage leading up to the election.

Illegal alien criminals absolutely have driven the news coverage. But that's beside the point.
All 3 groups I mentioned have zero right to be here, and many of those folks are victimizing American citizens. If democrats want to stand in the way of them all being shown the door, I'm here for it.

But it will be a very visible problem for Trump if nothing happens to fix the problems caused by those folks. His Administration probably can't limit deportation just to the three groups you mentioned.

Trump is approaching this in a rational fashion, which is
1. ID the groups that need to go
2. Prioritize the worst of the worst and send them packing first
3. Then decide what to do about the flood of asylum seekers that are here

We're on Step 1.

While Miller and Homan might have some ideas about prioritizing their targets, they haven't made any statements that would limit the program to just these three groups.

They don't need to. They have a lot of folks to clear out just in the first 3.

And finally, any program that seeks to deport 1.4 million people is going to affect a far larger number of people. Directly, of course, the efforts to apprehend the 1.3 million folks under deportation orders are going to reveal a large number of people here illegally who haven't yet been ordered to leave.

And...?
The people I listed have zero right to be here.

There's no way to do a large-scale deportation without having large-scale impacts, especially in regions and industries where undocumented workers are concentrated. Personally, I think there's a non-trivial chance that Trump is unable to pull off the large-scale deportation, and will instead just have some very highly publicized efforts that don't end up moving a whole lot more people than have been moved historically. But if he does pull it off, it's going to have some dire economic effects.

I don't accept this, because it's the school of thought that says, "Let's just throw up our hands and let everyone stay". That's not acceptable, and also not sustainable in either the short or the long run.

You should check out what happened at the last Chicago City Council meeting with respect to immigration.