Deportation and immigration are among the most divisive issues of our time. There are strong feelings, and valid arguments, on each side. The government cannot give out visas like they were free samples at Sam's, and the government cannot close the border and exclude everyone. That leaves an extremely large middle ground.
During jury trials, incarcerated defendants almost never appear in jail clothes or shackles. Even though judges tell jurors that pretrial detention means nothing in terms of guilt or innocence, there is a very real presumption of guilt if the defendant is in jail.