"Even if a moat was advantageous, perhaps even necessary, in defense, people living in settlements or palaces encircled by a moat might have to endure, then, the several inherent problems, such as the spread of pathogens, bad smells, the proliferation of mosquitoes, and others," concluded Dong Hoon Shin and colleagues, who excavated the moat ruins at Weolseong Palace, Korea.
Two thoughts on this.
First, micro-organisms were unknown so the link to disease is dubious in the minds of the inhabitants, and
Second, as a defensive system, it would seem logical to make the moat as unattractive as possible to potential attackers.
Although, were I personally designing the fortifications, I might be inclined to push the moat out from the walls to at least medium-to-long archery range.
Something is wrong here. War, disease, death, destruction, hunger, filth, poverty, torture, crime, corruption, and the Ice Capades. Something is definitely wrong. This is not good work. If this is the best God can do, I am not impressed.
-- George Carlin