Israel is safe because they do not have the constrictions of "civil rights". Obviously, this American woman was giving off bizarre vibes which security picked up on. She may very well have been an advanced checker of airline security to check out various responses to subtle body gestures. Terrorists could then send someone through using the same mannerisms which were not challenged.
Militants loyal to Islamic State claim suicide bombings in Nigerian capital (Reuters)
from the article: U.S. couple with Jewish roots didn't expect El Al's inquisition