As you say, the inconsistency on tariffs completely undermines this position, because it's widely known that tariffs which change radically from day to day don'

As you say, the inconsistency on tariffs completely undermines this position, because it's widely known that tariffs which change radically from day to day don't incentivize domestic production (and indeed disincentivize all domestic investment). Doesn't this prove that creating incentives for domestic production is not the point, and either there's no clever scheme or the real goal of the scheme is something else?