At a minimum it is a jobs program, and so can be viewed as part of the welfare state (a lot of government spending falls, at least partially, into this category).
Perhaps more importantly, it provides a national strategic interest that is not easily captured through economic analysis. When times are good and international trade happens smoothly this is not important, but when the international market breaks down for some reason, having domestic production gives our government more options in how to respond.
We saw this with covid, when every nation was scrambling critical resources to deal with the public health emergency. We see this now with Russia, who is regretting how dependent they on foreign trade; and in Europe who are regretting how dependent they are on Russian energy.
Perhaps more importantly, it provides a national strategic interest that is not easily captured through economic analysis. When times are good and international trade happens smoothly this is not important, but when the international market breaks down for some reason, having domestic production gives our government more options in how to respond.
We saw this with covid, when every nation was scrambling critical resources to deal with the public health emergency. We see this now with Russia, who is regretting how dependent they on foreign trade; and in Europe who are regretting how dependent they are on Russian energy.