Simple question, yet it seems nobody has EVER asked it - “How do we know if these ‘undocumented immigrants’ even WANT to become full American citizens, adopting ALL the American ideal, foreswearing their former allegiance or allegiances, and unreservedly obeying the laws and statutes of the United States and the various states?”
To come here, then to DEMAND that all the law, language, and customs of the former country be kept, is to invite chaos. The hyphenation of the term “American” does not, cannot be applied to loyalties. Your heritage or genetic makeup may be of another land and another way, but upon becoming “US Citizen”, that designation trumps all others.
You're being silly. They want to become American citizens, so they can vote for free stuff provided to them by a gargantuan government (one that they elect to take that "free stuff" from productive Americans).