if your laptop was full of anti-Iranian or anti-Syrian propaganda and they got angry, which is what I suspect happened here. Not to say it was right, but, did you read this person's blog? Not exactly someone you would think would be going to Israel to tour. If one is going to be provocative, sometimes there are consequences.
47 killed in clashes between ISIS, Syrian rebels near Turkey border, monitor says (Reuters)
from the article: Police shoot U.S. student's laptop upon entry to Israel