I disagree, large portions of the people traveling through airports are hopeful optimists going on vacation, honest ordinary people trying to play by complex, impenetrable rules, few of them are trying to game the system.
The real problem is the enormous numbers of false positives and the results on the unwitting victims
I was thinking more of all the people who go through this because the US has NO formal emmigration procedure - in any other country you pass through a desk with a customs agent who puts a stamp in your passport saying you have left the country - in NZ, my country, they wont let you leave if you have outstanding fines or warrants.
In the US there is none of this, you just roll up to the gate, it used to depend of some airline minimum wage check in people tearing little green cards out of your passport and them getting to the right government person who typed them in correctly - lots of times it didn't work correctly and people would attempt to come back into the US a second time and then get tossed out because they had "overstayed" their previous visa. A number of friends have been through this insanity.
Now days the US does this electronically some how, it seems more reliable (hopefully) - but is still completely out of the control of the traveler and it still leaves one without a receipt, a stamp in their passport, indicating they have left correctly under the terms of their visa
The real problem is the enormous numbers of false positives and the results on the unwitting victims