The US needs immigation. But illegal immigration is not needed. All countries need people who will work hard and be productive members of society, and follow the law. By coming to the US illegally, the illegal immigrants show that following the law is not their major concern.
Once the illegals are in the US, they benefit from US medical care (some ERs in the southwestern US are at the point of collapse) education (registering their children in schools), etc–without paying their share of taxes.
But the worst part is that the illegals are hired by places so that they do not have to pay social benefits. No social security, health insurance, etc. This creates a second-class system. One class gets all the benefits that society has decreed should be paid to people–and one class does not. This is immoral, and should be recognized as such. If we need to pay more for our lettuce–or more for our yard work, or more for our nannies, or more for our cleaning people–so that all of these workers can get the same living conditions as anyone else performing these jobs–I am personally willing to do so. Saving a few dollars is not worth establishing a two-class labor system. If we need the workers, open the borders to legal immigration. Illegal immigration is not the answer–and no country in the world can tolerate it.
As an example, how does Mexico treat the people who try to immigrate illegally across her southern border?