Is it really? It sounds like you're implying it's some kind of woeful ignorance, but I say it's perfectly reasonable:
1. Each US state is already in a open-borders zero-tariff framework with all other states, which covers a very large portion of what people purchase.
2. Until recently, most individual consumers didn't need to think about tariffs on international goods, since most purchases were <$800 and covered by the de minimis rule. (Which AFAICT was in place for ~80 years.)
