And, why don't the local law enforcement agencies have a responsibility of enforcing the emigration laws. They should be held responsible. Do they ignore other federal laws?
Well, one can occasionally here a mayor here or there declaring that he refuses to allow the police to work with the INS.
This is generally done in cities where the "vote" of both legal and illegal immigrants more then make up for any lost votes by law abiding citizens...
Yes. You never see local police raiding factories for violation the federal Equal Opportunity Employment Act.
Ever see a constable arrest someone for failing to file an income tax return?
Deputy sheriffs don't make OSHA inspections, or audit corporate records to see if they comply with FEC reporting rules.
On the other hand, you don't see FBI agents working speed traps, or Federal Marshals answering domestic violence calls.
You will learn about our federalist system of government in 10th grade civics class.