I didn't say they aren't, rather I focused on the higher-level context which seems more relevant.
> the efficacy of tariffs
I'm not arguing against tariffs in general. I'm taking issue with applying them twenty years too late (after entire industries have wholesale moved away), in an arbitrary, capricious, and illegal manner (dubious for encouraging long-term investment), while expecting them to create well-paying domestic jobs - the only ways to compete with Chinese labor prices are creating domestic "lights out" factories (which given the regime's continued rolling out the red carpet for cross-border capital, likely won't even be American owned), or devaluing our currency to turn our country into an impoverished manual-labor work camp of the type that China worked desperately to move beyond.
As I alluded to with my last parenthetical, I expect the main outcome to be further erosion of what domestic industry we have left (eg Amazon [0] is less competitive, but also any last-step value-add manufacturing / productization) in favor of an international just in time supply chain where this new national sales tax is only paid after a consumer has bought the product.
[0] I could see Amazon just moving most operations to customs-bonded warehouses though.