So YOU automatically assume, since he's obviously an illegal, that he was involved in the accident? The story doesn't even HINT at that possibility, so until there is some proof, or intimation from the authorities otherwise, I go with the assumption that he's an all right guy, just coming here for a better opportunity. The FACT that he could have easily have left that boy to die, if he were in fact some sort of illegal alien monster, bolsters THAT assumption.