Lumping in a lot of categories without defining who these people all isn't helpful: "‘undesirable’ — immigrants, people of color, the incarcerated and formerly incarcerated, activists, and others," There is a humanitarian crisis in Mexico with the drug war and cartels. People are going legally or not.
The report cited in the article by Mijente, the National Immigration Project, and the Immigrant Defense Project definitely has an agenda of its own and does not like the Trump administration one bit. Saying it's part of a "larger white supremacist project" is a bold statement.
Humanitarian crises are happening all over the world, and you're right, downrightmike, people are going legally or not, and for many, many reasons.