What is legal and what is moral frequently differs.
Well if the crimes are all 20 years old, and they haven’t been a problem since, I don’t have a problem letting them remain.
But the article only says some of the crimes are old. And I don’t see where we have a moral obligation to let immigrants who are committing crimes in this country remain.
Living in their home countries didn’t kill them before they came here. And if it will kill them to go back, then maybe they should have thought about that before they committed crimes here.
I consider drug dealers/pushers to be the moral equivalent of murder.