By the time you're answering those 'intrusive' questions, you've already been selected as a person of interest by the ticket, payment, and those flags kicked off from a scan though various listings. In simple terms - profiling.
And, you base this on personal experience, or just from what you've read?
I've flown into Israel a number of times. Several times as an active-duty member of the US Navy. They "interrogate" everyone. Some people, they just interrogate more.