Walls do work

I  saw an article in Haaretz [a leftist newspaper] that said walls do not work. That was before the wall keeping out terrorists was built.  After it was built even only about a fourth, the difference in terrorist incidences was very noticeable. The amount of bombs going off in  areas and in malls was reduced greatly. I learned then that people can write clever editorials that sound good but do not correspond to reality.