Because they want the infiltration of anyone and everyone who wants to come here. They haven't thought things through. Parts of California already look like a bad third world country. 3/4 of the population of the planet is in poverty and has no education and very bad values. They won't all fit in the U.S. It's a simple matter of land mass. And without the values of most Americans, we are doomed. Haven't we experienced enough theft, rape, murder and - all crimes in the last few decades of massive immigration from those countries? I'd say way too much. We used to leave our doors unlocked and to pay for something - write a check. They were accepted. Now, we not only lock our doors but lock the windows, bar the windows, and we get one or more big dogs. Checks are accepted only in "some" places and not without a photo ID, matching address, phone number, and some background checking.