Heh, a couple of years ago (maybe true still?) Canada had a 99%! tariff on aluminum extrusion from China. And it was still cheaper than domestically sourced material at twice the price.

Alas, no. Just because there are certain rules, and just because people say that those rules are for a specific reason, doesn't imply any actual causality between the reasons given and the rule existing.

Especially anti-dumping rules are most often just exploited as a tool to get a competitor in trouble.