Don Boudreaux teaches some elementary--but unfortunately too often unlearned--lessons about international trade.
First, specific jobs are destroyed (and created) by any and all economic change, not just by economic change that is connected with international trade. If saving workers from the difficulties, financial and emotional, of losing jobs is a sufficient justification for government to obstruct voluntary exchanges, then Mr. Moroni (like the vast majority of protectionists) is far too modest when proposing government intervention: he should want government to stop all economic change because the concerns that motivate his opposition to free trade arise with all economic change.
When people reduce their likelihood of smoking, some workers in cigarette factories lose their jobs. So the logic of Mr. Moroni’s argument should lead him to endorse government policies that prevent people from giving up smoking and from discouraging their children from smoking. When automotive technology improves such that automobiles need fewer tune-ups, the logic of Mr. Moroni’s argument should lead him to endorse government polices to suppress technological improvements (in order to save auto mechanics the embarrassment and indignity of having to tell their families that they’ve lost their jobs).
I used to tell my classes that Jonas Salk threw a whole lot of iron lung makers out of work.