It’s neither okay nor sustainable

Source?

You realize mass deportations would decimate the economy? Some cities are 10% undocumented immigrants; Florida is 5% undocumented immigrants. Undocumented immigrants are a significant part of the U.S. economy and culture.

It would also be a horrific endeavor. Police going door-to-door demanding documentation. Probably social surveillance similar to Nazi Germany (along with all the false accusations). 4 million child U.S. citizens would have their parents hauled away. There will need to be concentration camps to hold all those people before travel (if they would actually get around to doing that).

“Law breakers,” isn’t a very good argument. Everybody breaks the law (speeding, jay-walking, etc). The system is currently working as intended, and encouraging people to break the law to acquire an easily exploitable workforce. Incidentally, undocumented immigrants commit far less crime than citizens.