Why, because they are half wits doing the bidding of manipulative men who scheme with lies to obtain power.You have no argument at all. Undocumented workers don't hire themselves. You place all blame for the situation on the workers, and none on those who employ them. Why don't you want their employers arrested and prosecuted.
Employers are the ones driving illegal immigtation. Democrats prosecute employers and people stop coming because there are no jobs. Trump stopped all prosecution of employers, and the numbers skyrocketed. He did that on purpose.
Report: Trump Happily Employing Undocumented Workers Amid ICE Raids
The president is fine with an immigrant “invasion” when it’s benefitting him financially.www.vanityfair.com
Feds targeting more worksites crack down on undocumented workers – but not their employers
The Trump administration ramped up arrests nationwide at worksites with undocumented immigrants, arresting more workers than employers.www.usatoday.com
In Texas, lawmakers don't mess with employers of undocumented workers
For all their condemnations of illegal immigration, Texas lawmakers — Republican and Democratic — have shown little interest in cracking down on businesses that employ undocumented workers.www.texastribune.org
As for Obama:
Obama holds record for cracking down on employers who hire undocumented workers, says Wasserman Schultz
President Barack Obama is the boss-buster in chief when it comes to going after employers who hire undocumented workers,www.politifact.com
A Crackdown on Employing Illegal Workers (Published 2011)
The Obama administration has moved the focus on illegal immigration from workplace raids to indictments against people who hire unauthorized workers.www.nytimes.com