Its all a really old blood feud.
Cease fire, then a bombing that Palestine claims came from a extremist group (yet been linked to repeatedly). If you want a definition of "ineffective", you'll see Mr Arafat's picture in the dictionary for everytime he "condones these attacks".
Build a wall? Why not. Sure.
Will it stop the attacks? No. Slow them down? Maybe.
If the Arabs want to help their Palestinian brothers so much, come n get em.
Meanwhile, Im pretty peeved at all the handouts we, the US Gov't, give these countries in foreign aid. Nope, sorry, not into buying friends. Seems to be a long list of peoples and places we have helped along who only turn around and want to murder us at the first chance they get. (Kuwait, etc etc)
Sometimes, financial isolationism sounds like a good idea to me