...I'm still baffled by the zeal of the anti-immigration crowd.
How do they benefit by any of this? Especially in this specific case.
Why keep pursuing this approach when it's clear it is incredibly unpopular & the benefit is so inobvious.

But, those around home drove it. (Miller)
It's not working; it's terribly unpopular; it's dragging down the entire administration (that and Epstein); they backed off in reaction, then they go after a soldier's wife.
It benefits nobody & serves no purpose.
I'd think his advisors would call for a "stand down" just to preserve some political capital.

The benefit for them is satisfaction. It makes them feel good.

The entire country is about to end, but at least they were able to stick to the brown people.

Around forty-eight years ago, when I was starting out as a performer, I kind of figured that this whole 'racism' thing would be gone by the turn of the century.

It makes me sick to my stomach.

... was a thin veil for Trump's, and especially Miller's, bigoted desire "Make America White Again". Miller gave the green light to specially recruited sociopaths with zero compunction about ignoring the law and using unrestrained savagery to impose fear and terrorize entire big city populations into subjugation.
It hasn't quite worked out to their expectations. The majority of Americans are better – and stronger – than that. That's why the evil leaders of this fiasco have wisely chosen to live in a military compound. But, in the end, that ain't gonna save their worthless asses.

Screwing a military spouse purely out of spite

on how he did his paperwork and a couple other things, he could potentially get administratively separated from the military if he didn't disclose it when asked.
I know a guy who got booted because he didn't disclose that his mother came here via illegal entry. They deported his mother and then tossed him. He packed up and moved to Mexico with her even though he was born here.