Binyamin, there has always been some security along the border where the wall will be built. If suicide bombers attempted to infiltrate there most of them would probably be caught, which would humiliate them and rob them of their chance at "martyrdom". The wall is meant to deal with the fact that a large percentage of infiltrators still get through, which is a serious vulnerability in the long term.
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from the article: IDF, Netanyahu disagree on extent of refugee 'tidal wave'