Because it's so obviously not going to work.
I suspect that if enough of them were arrested, prosecuted,jailed or fined some form of punishment) across the country, news would get back to the homeland and the flood would start to stem, at least a bit, while other reforms were undertaken. If you recall, until the first amnesty, unfortunately under Reagan, there wasn't much border jumping, until the green light of "look the other way" combined with businesses looking to hire people for dirt pay and no benefits, combined with declining birthrates and whore politicians, well, look where we're at now. I don't propose there is a simple solution, but several different tactics done collectively may start to work. I don't know where you live, but I've seen a five fold increase in the Hispanic population in the last twenty to twenty five years, with no let up in sight. What do you suggest, CBG?
Add in the "three strikes and jail" law for good measure
You must be lonely without the rest of your FOQNA loons...