This is probably the economic equivalent of banning say mobile phones or some other large and important sector.
For years the thinking has been that China is liberalizing, and it will eventually open up and that reciprocal sanctions or tariffs will spark unnecessary protectionism and encourage China to reverse direction.
A lot of people now, after 20-30 years of similar behaviour, believe that China was just gaming the system all along and had no plans to liberalize politically or allow fair competition from foreign business. Trump certainly tapped into that (although I think there's some consensus that punitive tariffs still won't be useful).
In the case of an import tariff, it is paid entirely by consumers, and domestic suppliers get a windfall from it, rather than sharing the burden. That's because there are two supply curves in play, domestic and international, and only one demand curve, because consumers generally don't care where the goods come from, and the internal trade of foreign markets is ignored.