I travel outside of the US for business 10-12 times a year. My only thought when I return and am about to go through immigration and customs is about catching my connection home, since I usually plan on the shortest layover possible. I couldn't care less about questions asked by the immigration and customs officers, even if they seem irrelevant. I answer them pleasantly and confidently because it's the ticket to my next flight. And, no, this country is not becoming a police state. The officers are trained to unsettle people and see how they regain their composure. Legally, they can ask anything they want.