Stands to reason. Kal-El's an illegal himself, after all.
He actually brought that up during the episode, first telling the illegal he was harboring that he "knew what it was like to be out of place" and that he was from "a lot farther away than Mexico", then later, to expose his mother's supposed hypocrisy because she falsified adoption papers for him, even though he was, as he put it, "an illegal immigrant".
Awwww - Ya beat me to it.