We don't clothe ourselves, we don't feed ourselves...we don't make our own electronics. At some point, those who supply these things might decide to tighten the noose; and what will we do then? We won't even know how to begin. We certainly won't have the industrial infrastructure, nor the knowledge base to use it if we had it.
Economics is a critical element of national security - and the loss of strategic industries and skills as as potentially disasterous as a gap in missiles, tanks, or bombers. Perhaps it is even more dangerous than such a lack.
Sarcasm is seven letter word!