Why use the Border Patrol for their intended purpose of catching illegal entries at the border, when instead, you can leverage nationwide interior checkpoints at airports for papers-please checks of innocent citizens and Stasi-like control of the populace? Never mind which one of these two policies will catch a larger number of illegals and harass fewer innocent citizens and legal foreigners.

BTW, "innocent illegals" is an oxymoron. Entering the country illegally is a crime. Stealing the SSN of a citizen, either by stealing it or guessing it, and using it to commit labor fraud is a crime and should be a more serious crime. And the crime is not victimless despite the claims of many apologists for illegals--the innocent citizen with the stolen identity can suffer years of debt collector calls, harassment, credit delays, and even threats from the IRS.

All from the "innocent" actions of an "innocent" illegal. I know from family experience. When my family has been compensated for their inconvenience, the tens of thousands of $ of property that was stolen in a home breakin by illegals is returned, and the criminal scum that did it are locked up in prison, then I'll consider having some smidgen of sympathy for a single illegal.