The study is bogus. Here’s an example:

“ Although unauthorized immigrants have generally been in the United States for a shorter period of time than the U.S.-born, they do not disproportionately consume public health care benefits”

Note the word “disproportionate.” So because unauthorized immigrants consume proportionately less medical resources, that’s somehow a benefit? How about we have zero illegal immigrants, consuming no medical resources whatsoever? Wouldn’t native Americans be better off if scarce, and expensive, medical attention wasn’t given to those here illegally?