You'll get no disagreement from me.
On the other hand, it's also a far cry from saying that 9/11 had nothing to do with the greater problem of Illegal Aliens in general.
In part, the terrorists were able to exploit the black market and security lapses precipitated by the presence of millions of Illegals.
It' also a fact that at least some of them WERE illegals. They may have came here legally,but they had overstayed their visas and this made them "illegals".