I am not sure why

I am not sure why this surprises or upsets anyone:

Israeli moves to erect security fences and protective walls have enraged Palestinians who call it another form of collective punishment. Analysts say unilateral separation may be unrealistic and harmful to peace efforts.

We have been using fences for years in West Virginia to keep animals out of areas we don’t want them (or conversely, in areas we do want them).

Update: Jay Zilber has it right.