This seems to me to be the only plausible explanation. It's Israel fortifying itself. Unfortunately, however, it was presented from a position of weakness and conciliation, and that has only emboldened the Palestinian nutcases, including their new great leader. But I guess they'll find out the true reason, sooner or later.
All I can say is that I hope that is why they're doing it. Seeing the images of settlers being torn from their homes was, well, unsettling.