My pal, recently of Israel, sends me this email:
The separation fence made a huge difference in civilian fatalities. A good example of when a government responds well to the fundamental safety of its citizens.
When I think about the fence and the screening of Arabs who want to enter Israel, it is a hardship. Just as trying to get onto a plane today is for so many people. It is a hardship precipitated by a small number of murderers that affects millions of innocent civilians. Same for trying to get into the US today: if you're an alien, the process is more difficult. (An Israeli friend described his "reception" in US recently. Very unpleasant. Yet, he does not hold it against the Americans.)
It is shortsighted to blame the government for doing somethings that protect its citizens (and adversely affects both foreigners and its citizens (Israeli citizens go through unpleasant, routine checks of car, body, etc... when entering any public hall or private facility).
The other side of this is how really effective this terrorist tactic is: make the lives of millions miserable with relatively little effort and cost.
Here's the chart of terror in Israel, before and after. - Fixed