so basically stop all financial activity of a certian group and make it impossible to maintain a standard of living just because of their legal status.
Absolutely, yes.
This "certain group" are people who are trespassers and multiple-count thieves.
By taking this ethically appropriate action against their on-going criminal activity we function to prevent it, to put an end to it, obviously.
only one problem: how can you find all 20 million illegal immigrants? they aren't all in one place.
We don't need to "find" all 20 million
illegal aliens, or "illegals" for short. (They simply
aren't "immigrants", as I accurately pointed out to you previously, so it is erroneous to call them illegal "immigrants" -- the proper government statute term for them is "illegal aliens", or "illegals" for short.)
We simply begin enforcing the recently improved e-verify with unscrupulous Benedict Arnold business owners and managers highly suspected of hiring illegals.
We thereby catch the offending illegals and their accomplice business owners/managers.
Once these illegals can no longer find work, they will run out of cash.
We also step up enforcement searches of identify fraud, which will catch illegals' credit cards under forged names and the like.
It can be done, and comparatively easily.
But, again, you focus, and erroneously so, on low level mechanics, when the matter is one of high level philosophical ethics.
Forcing self-deportation of the 20 million illegals is simply the right ethical thing to do by the foundational people to whom American law and officials are
responsible and accountable: American
citizens, the people whom the 20 million illegals egregiously wronged.
It is important in making correct decisions, especially in a country where the Constitution and rule of law is rightly respected, to put doing the right thing ahead of "oh, it's just too hard" mechanics whining by liberal Dems with a political power-play agenda.