These are run by the upper echelon of the Pentagon and others in DoD who WOULD take those things and others you (myself, and the public) dont know about into account.

Dexter Filkins talked about this on NPR Fresh Air recently. From memory a bit ago but basically as an island lots of things are imported, including the means of energy production. The island could be without power within a week or so of a blockade at the cost of 0 Chinese lives.

Elsewhere in the interview its mentioned that in war games the US simulates in an escalation that the US loses. One official stated we (the US) simply don't have the industrial base to manage a sustained conflict against the Chinese.