I may be missing the point, but you are missing reality.
They are here, they are going to be on our roads, certified or uncertified, insured or uninsured. There is no politician likely to be elected to major office who is going to have the political will to mobilize the massive forces to round up 12,000,000 people, provide the transportation and deal with the countries they would have to be sent or delivered to. Can you imagine any Congress likely to be elected in the near future that will provide the funds for such an enterprise? Just try to picture it, and then decide who is missing the point.
Seens you are new to these immigration threads. You don’t need to round them up. Just stop the trillion dollars in freebees they are getting and they will self deport for the most part.