I spent six years in Israel listening to Sabras excusing all sorts of self centered, unethical and down right mean things with excuses of "well, you just don't understand us!" There's no excuse for shooting a laptop, it doesn't defuse anything. If a bomb had truly been suspected, much more care would have been taken. It's just more of the "big fish in a small pond" syndrome that endangers Israel much more than the terrorists do.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Police shoot U.S. student's laptop upon entry to Israel