Who are the scofflaws?
A scofflaw is one who knowingly flouts the law, especially by failing to comply with a law that is difficult to enforce effectively. Under federal law, it is illegal to give aid and comfort knowingly to any illegal alien; see 8 USC 1324 and 1324a.
When the states comprising this great country decided to join together under the U.S. Constitution, one of the main reasons was to provide for the common defense. They essentially contracted with each other to comply with the Constitution for their common benefit.