Boy did you miss my point. If they apply the meaning as merely being on our soil, then it is better NOT TO have that language.
The way I read Wong Kim Ark, the courts have decided to interpret the language as meaning merely being on our soil, and the "subject to the jurisdiction" clause is read to exclude persons having diplomatic immunity.
I would add that being a law breaker would reinforce the court's opinion that those here illegally are subject to the jurisdiction.