Not the citizens of other nations. It strains our emergency rooms, and causes the cost of health care insurance to increase for everyone else as that lost money has to be made up by hospitals/clinics some way in order for them to keep their doors open. It forces school districts to pick up the tab for having ESL teachers, making citizens pay for the education of illegals.
And you seem to operate under the same false impression as our compadres on the left, that the goal for illegals is to become a citizen. I suggest you research a Pew Hispanic Research Center study that debunks that myth.