Answer
This is a bad belief because when stiff controls are put on goods that offer competition with U.S trades, many problems will occur such as hurting of the U.S exports.
Step-by-step explanation
When tariffs are placed on imports, tariffs will have to be placed on export too. This will result into hurting citizens in the long-run. For example, in the Smoot-Hawley Tariff Act of 1930 where president Hoover raised protective tariffs on imports so as to protect American business, the process backfired a led to more depression because other countries also increased tariffs with affected U.S exports.