The reason that Israel has taken so much land in the west bank is because it was so easy to do. Nobody stood in their way. America and the EU stood back and made faint clucking sounds, which Israel ignored. In fact, I suspect that Israel was surprised at how easy it was to expand the settlements. It is still easy.
U.S. State Dept. condemns 'vicious terrorist attack' that killed Palestinian infant (Haaretz)