I think the proposed dirt moat around Baghdad is a good idea and it is about time that this idea was established. The same should be used in Kabul and Kandahar. The “moat” has an ancient tradition and is effective against marauders, the old name for terrorists. It is not effective against armies.
Considering the multitude of voices against the same kind of wall keeping Palestinian terrorists and car thieves out of Israel, it is wonderful to see the idea spreading.