Why is Israel allowing weapons smuggling into Gaza?

I have discussed the problem of weapons smuggling into Gaza many times on this blog (the search "smuggling, Gaza" returned twenty-one hits on this blog). But until I discovered this post on DEBKAfile late last night, I thought that the reason we weren't stopping the weapons smuggling was that Ehud K. Olmert and his gang of incompetents weren't willing to did not have the courage to send in the