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All these things must come through tears because there is no source of raw materials visible ANYWHERE in Columbia.

Tears have all kinds of nasty things on the other side of them and anyone going through them or being exposed to the  (probably much more than Comstock was) would likely die very quick.

And if its supplied from the ground then something must be used to pay for that source which after years would run out. It also would be a vulnerability/liability allowing agents of the US Government (or some foreign power) to get to Columbia and take it back.