Is there a reason to believe that the distribution of funds vs the economic activity generated by illegal immigrants is significantly different from any other group?
I'm not sure how accurate it was, but someone wrote a piece about how there's just no way to measure how much a cost that group of people inflict vs contribute. The title of the article kind of says it all, undocumented and unmeasured.
https://www.city-journal.org/html/undocumented-and-unmeasure...