I would be blunt enough to counter such questions as this doesn't really make sense that the interviewer ask such questions when it is already mentioned in the application the purpose of visit. And I would tell him, if I wanted to migrate to US, I would apply for H1B visa instead of tourist visa so I could try my luck in the job market. But the problem is there are millions native jobless in state. So the issue remains in revising local regulations and security measures to control illegal immigration rather making a potential tourist feel inside an interrogation cell feeling as a wictim of Minority Report.