All my ancestors had to do to become American citizens was get on a boat in Europe and not shit themselves to death by the time it arrived in New York. Why should it be any harder than that?
“Law never made men a whit more just; and, by means of their respect for it, even the well-disposed are daily made the agents of injustice.” — Henry David Thoreau
In any case it’s not the deportation that most people necessarily have an issue with, it’s how they go about doing it. They even killed citizens in the process. Obama deported quite a few.